placestats

One-person households vs. Physicians

Fades after adjusting for income

Across 142 countries, One-person households and Physicians rise and fall together at r = +0.67 (on a scale from −1 to +1, where 0 means no link). Comparing only countries with similar income (GDP per person) shrinks it to +0.29, which could easily be chance (q = 0.089, allowing for the many pairs tested, and allowing for countries in the same region being alike). So the first figure mostly shows richer countries differing from poorer ones, not a link between these two things.

Comparing countries across the middle half of one-person households, 6.52% to 22.6% of households, physicians is better by 1.74 per 1,000 people at the top of that range than the bottom. Comparing only countries with similar national income, the gap is 0.623 per 1,000 people.

Link before adjusting (r)+0.668p = 1.0e-19 · 142 countries
After adjusting for national income+0.290p = 0.000 · likely range [+0.13, +0.43]
p, allowing for regions0.015standard error 0.085 · 7 regions
Check for luck (q)0.089across 12,497 pairs

How to read these.r runs from −1 (one goes up as the other goes down) to +1 (they rise together), and 0 means no link. Adjusting for national income means comparing countries with the same GDP per person, so differences in wealth can’t explain the link. Income is used in percentage terms, since an extra $1,000 means more to a poor country than to a rich one. p is how likely a link this strong would be if there were really none. Below 0.05 means it is unlikely to be chance. Very small values are written in short form: 1.1e-32 means a decimal point followed by 31 zeros and then 11, so very close to zero. The likely range is where the true figure probably lies, and a range that crosses zero means the link could easily be chance. Countries in the same region tend to resemble each other, so the third figure allows for that, which gives a fairer p. The standard error is the typical size of the error in r. Finally, testing this many pairs means some will look strong by luck alone. A q below 0.05 means this link is unlikely to be one of those.

One-person households · % of householdslink with income +0.70 · high
Physicians · per 1,000 peoplelink with income +0.85 · proxy

Both of these rise and fall closely with national income, so a strong link between them before adjusting was close to certain. Read the adjusted figure, not the first one.

“Link with income” is how closely each measure tracks GDP per person across countries, from −1 to +1.

Every country as a dot

One-person households · % of households →Physicians · per 1,000 people →0.19%41.1%0.0386.58Afghanistan: 0.19% of households, 0.317 per 1,000 peopleAngola: 10.8% of households, 0.244 per 1,000 peopleAlbania: 9.95% of households, 1.88 per 1,000 peopleArgentina: 22.8% of households, 5.11 per 1,000 peopleArmenia: 15.2% of households, 3.36 per 1,000 peopleAustralia: 22.8% of households, 4.09 per 1,000 peopleAustria: 36.3% of households, 5.51 per 1,000 peopleBurundi: 6.04% of households, 0.078 per 1,000 peopleBelgium: 34% of households, 3.57 per 1,000 peopleBenin: 9.78% of households, 0.216 per 1,000 peopleBurkina Faso: 6.64% of households, 0.148 per 1,000 peopleBangladesh: 2.85% of households, 0.722 per 1,000 peopleBulgaria: 30.8% of households, 4.33 per 1,000 peopleBahamas, The: 17.7% of households, 1.9 per 1,000 peopleBosnia and Herzegovina: 11.5% of households, 2.58 per 1,000 peopleBelarus: 38% of households, 4.72 per 1,000 peopleBelize: 17.2% of households, 1.09 per 1,000 peopleBolivia: 20.5% of households, 1.28 per 1,000 peopleBrazil: 12% of households, 2.36 per 1,000 peopleBarbados: 26.3% of households, 2.96 per 1,000 peopleBrunei Darussalam: 7.22% of households, 1.89 per 1,000 peopleBhutan: 6.13% of households, 0.553 per 1,000 peopleCentral African Republic: 6.2% of households, 0.074 per 1,000 peopleCanada: 28.2% of households, 2.82 per 1,000 peopleChile: 20.2% of households, 3.33 per 1,000 peopleCote d'Ivoire: 17% of households, 0.166 per 1,000 peopleCameroon: 15.3% of households, 0.136 per 1,000 peopleCongo, Dem. Rep.: 7.55% of households, 0.208 per 1,000 peopleCongo, Rep.: 13.8% of households, 0.173 per 1,000 peopleColombia: 11.1% of households, 2.54 per 1,000 peopleComoros: 4.91% of households, 0.424 per 1,000 peopleCosta Rica: 12.1% of households, 2.69 per 1,000 peopleCyprus: 20.8% of households, 3.56 per 1,000 peopleCzechia: 32.5% of households, 4.35 per 1,000 peopleGermany: 37.3% of households, 4.53 per 1,000 peopleDominican Republic: 20.1% of households, 2.43 per 1,000 peopleAlgeria: 1.61% of households, 1.66 per 1,000 peopleEgypt, Arab Rep.: 6.48% of households, 0.671 per 1,000 peopleSpain: 23.2% of households, 4.29 per 1,000 peopleEthiopia: 6.36% of households, 0.143 per 1,000 peopleFinland: 41% of households, 3.61 per 1,000 peopleFiji: 5.94% of households, 0.813 per 1,000 peopleFrance: 35.5% of households, 3.28 per 1,000 peopleGabon: 22.4% of households, 0.521 per 1,000 peopleUnited Kingdom: 30.6% of households, 3.3 per 1,000 peopleGeorgia: 15% of households, 5.64 per 1,000 peopleGhana: 21.5% of households, 0.266 per 1,000 peopleGuinea: 5.07% of households, 0.21 per 1,000 peopleGambia, The: 9.72% of households, 0.09 per 1,000 peopleGuinea-Bissau: 4.14% of households, 0.252 per 1,000 peopleGreece: 25.7% of households, 6.58 per 1,000 peopleGuatemala: 4.33% of households, 1.28 per 1,000 peopleGuyana: 15.8% of households, 1.39 per 1,000 peopleHonduras: 10.4% of households, 0.489 per 1,000 peopleCroatia: 24.6% of households, 3.91 per 1,000 peopleHaiti: 9.43% of households, 0.292 per 1,000 peopleHungary: 32.1% of households, 3.46 per 1,000 peopleIndonesia: 7.1% of households, 0.524 per 1,000 peopleIndia: 5.11% of households, 0.723 per 1,000 peopleIreland: 22% of households, 3.88 per 1,000 peopleIran, Islamic Rep.: 7.16% of households, 1.81 per 1,000 peopleIraq: 1.01% of households, 1.02 per 1,000 peopleItaly: 31.1% of households, 4.19 per 1,000 peopleJamaica: 28.2% of households, 0.46 per 1,000 peopleJordan: 4.36% of households, 2.85 per 1,000 peopleJapan: 34.5% of households, 2.65 per 1,000 peopleKazakhstan: 15.5% of households, 3.75 per 1,000 peopleKenya: 19.4% of households, 0.289 per 1,000 peopleKyrgyz Republic: 12.3% of households, 1.57 per 1,000 peopleCambodia: 3.37% of households, 0.211 per 1,000 peopleKiribati: 3.71% of households, 0.193 per 1,000 peopleKorea, Rep.: 31.8% of households, 2.61 per 1,000 peopleLao PDR: 3.18% of households, 0.331 per 1,000 peopleLiberia: 12% of households, 0.178 per 1,000 peopleSt. Lucia: 26.8% of households, 4.23 per 1,000 peopleLesotho: 18% of households, 0.235 per 1,000 peopleLithuania: 31.7% of households, 4.47 per 1,000 peopleLuxembourg: 33.3% of households, 2.98 per 1,000 peopleLatvia: 41.1% of households, 3.4 per 1,000 peopleMorocco: 7.2% of households, 0.74 per 1,000 peopleMoldova: 22.6% of households, 4.02 per 1,000 peopleMadagascar: 7.11% of households, 0.172 per 1,000 peopleMaldives: 4.49% of households, 2.23 per 1,000 peopleMexico: 10.1% of households, 2.59 per 1,000 peopleNorth Macedonia: 11.8% of households, 2.94 per 1,000 peopleMali: 3.11% of households, 0.188 per 1,000 peopleMalta: 22.6% of households, 4.51 per 1,000 peopleMyanmar: 5.35% of households, 0.757 per 1,000 peopleMontenegro: 15.4% of households, 2.78 per 1,000 peopleMongolia: 8.96% of households, 4.13 per 1,000 peopleMozambique: 8.41% of households, 0.175 per 1,000 peopleMauritania: 3.97% of households, 0.261 per 1,000 peopleMalawi: 7.2% of households, 0.054 per 1,000 peopleNamibia: 17.4% of households, 0.553 per 1,000 peopleNiger: 3.19% of households, 0.038 per 1,000 peopleNigeria: 14.7% of households, 0.38 per 1,000 peopleNorway: 39.6% of households, 4.97 per 1,000 peopleNepal: 4.51% of households, 1.01 per 1,000 peopleNew Zealand: 21.9% of households, 3.61 per 1,000 peoplePakistan: 1.08% of households, 1.16 per 1,000 peoplePanama: 13.4% of households, 1.63 per 1,000 peoplePeru: 16.8% of households, 1.69 per 1,000 peoplePhilippines: 9.18% of households, 0.792 per 1,000 peoplePoland: 24% of households, 4.03 per 1,000 peoplePortugal: 21.4% of households, 5.85 per 1,000 peopleParaguay: 10.4% of households, 3.89 per 1,000 peopleWest Bank and Gaza: 4.31% of households, 2.17 per 1,000 peopleQatar: 6.98% of households, 3.02 per 1,000 peopleRomania: 26% of households, 3.63 per 1,000 peopleRussian Federation: 25.7% of households, 5.11 per 1,000 peopleRwanda: 7.69% of households, 0.09 per 1,000 peopleSudan: 1.59% of households, 0.25 per 1,000 peopleSenegal: 6.92% of households, 0.109 per 1,000 peopleSingapore: 16.1% of households, 2.83 per 1,000 peopleSierra Leone: 6.42% of households, 0.134 per 1,000 peopleEl Salvador: 8.46% of households, 1.62 per 1,000 peopleSomalia, Fed. Rep.: 1.53% of households, 0.048 per 1,000 peopleSerbia: 21.8% of households, 3.1 per 1,000 peopleSao Tome and Principe: 13.8% of households, 0.464 per 1,000 peopleSuriname: 14% of households, 1.35 per 1,000 peopleSlovak Republic: 25.3% of households, 3.7 per 1,000 peopleSlovenia: 32.6% of households, 3.37 per 1,000 peopleEswatini: 21.7% of households, 0.557 per 1,000 peopleChad: 5.43% of households, 0.085 per 1,000 peopleTogo: 15.7% of households, 0.08 per 1,000 peopleThailand: 21.6% of households, 0.541 per 1,000 peopleTajikistan: 2.88% of households, 1.87 per 1,000 peopleTurkmenistan: 3.74% of households, 1.93 per 1,000 peopleTimor-Leste: 6.41% of households, 0.752 per 1,000 peopleTonga: 6.94% of households, 1.01 per 1,000 peopleTunisia: 6.27% of households, 1.31 per 1,000 peopleTuvalu: 6.92% of households, 1.35 per 1,000 peopleTanzania: 9.63% of households, 0.134 per 1,000 peopleUganda: 13.2% of households, 0.191 per 1,000 peopleUkraine: 25% of households, 3.53 per 1,000 peopleUruguay: 17.6% of households, 4.67 per 1,000 peopleUnited States: 27.9% of households, 3.68 per 1,000 peopleViet Nam: 10.5% of households, 1.11 per 1,000 peopleSamoa: 4.4% of households, 0.561 per 1,000 peopleSouth Africa: 23.8% of households, 0.794 per 1,000 peopleZambia: 7.97% of households, 0.324 per 1,000 peopleZimbabwe: 12.9% of households, 0.136 per 1,000 peopleAFGAUTBLRGEOGHAGRCJAMLVAMNGNORSDNSOM

best-fit line line after adjusting

Four ways to measure the link

MethodrpCountries
Standard (Pearson), not adjusted+0.6681.0e-19142
By rank (Spearman), not adjusted+0.6259.6e-17142
Standard (Pearson), adjusted for national income+0.2900.000142
By rank (Spearman), adjusted for national income+0.0600.479142

The rank version uses only each country’s place in line, from lowest to highest, so a few extreme countries count for less. The adjusted and unadjusted versions use the same 142 countries: those that report both measures and GDP per person. So the gap between them comes from the adjustment, not from a change in which countries are counted. Drop in the size of r after adjusting: +0.379 (a minus sign means it grew).

How solid is it?

Leaving out one country at a time, r ranges from +0.264 (without BRN) to +0.311 (without JAM). The bar above shows that range on a scale from −1 to +1, with the solid line at the full result. The single country that moves r most: BRN (-0.025).

Within each region

Countries are not separate, unrelated cases, and neighbors share a lot. A link that holds inside each region is far more believable than one that shows up only when comparing regions.

nr
East Asia & Pacific20+0.24
Europe & Central Asia39+0.25
Latin America & Caribbean23+0.20
Middle East, North Africa, Afghanistan & Pakistan12+0.54
Sub-Saharan Africa41+0.20

By income third

If the link shows up only in the richest third of countries, it is a feature of rich countries, not a general pattern.

nr
Poorest third48-0.42
Middle third47+0.09
Richest third47+0.32

By largest religious group

Countries grouped by a label they share, such as main religion, rather than by a number. Groups of fewer than twelve countries are not shown. These groups differ in income, region and history all at once. So a gap between them is a place to start asking questions, not an answer.

nr
Christians90+0.22
Muslims36-0.08

By last european coloniser

Countries grouped by a label they share, such as main religion, rather than by a number. Groups of fewer than twelve countries are not shown. These groups differ in income, region and history all at once. So a gap between them is a place to start asking questions, not an answer.

nr
France22-0.47
Never a European colony15-0.35
Spain16+0.30
United Kingdom44+0.18

Without outliers (countries far outside the middle half of countries on either measure, by more than one and a half times the width of that middle half): r = +0.290 after dropping 0 countries.

Two series, one country

Both measures over the years for one country you pick. The two charts are stacked so they share only the years along the bottom.

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Over time, within countries

Everything above compares countries with each other at one moment. This section compares each country only with itself over 0years. So a link here can’t come from anything about a country that stays the same, such as its history, geography, institutions or culture.

Not enough history inside each country to look at this over time. That needs countries measured for several years in a row, and at least one of these measures is measured too rarely.

The data


% of households
per 1,000 people		Years
Latvia LVA41.1%3.42021, 2022
Finland FIN41%3.612010, 2021
Norway NOR39.6%4.972011, 2023
Belarus BLR38%4.722019, 2023
Germany DEU37.3%4.532011, 2022
Austria AUT36.3%5.512011, 2023
France FRA35.5%3.282015, 2022
Japan JPN34.5%2.652015, 2022
Belgium BEL34%3.572011, 2022
Luxembourg LUX33.3%2.982011, 2017
Slovenia SVN32.6%3.372015, 2022
Czechia CZE32.5%4.352011, 2022
Hungary HUN32.1%3.462011, 2022
Korea, Rep. KOR31.8%2.612020, 2022
Lithuania LTU31.7%4.472011, 2022

United Nations, Department of Economic and Social Affairs, Population Division (2022). Database on Household Size and Composition 2022.
World Bank, World Development Indicators

Sources

One-person households

Share of one-person households

United Nations Department of Economic and Social Affairs, Population Division · via Our World in Data · CC BY 3.0 IGO · updated irregular (2017, 2019 and 2022 editions)

Households of one person, from the same UN collection as the single-parent share and with the same limits: one to three readings per country, from sources that sort households differently, and few after 2019. It rises with age and with income, and falls with family size. That is three different things in one number. No "better" direction is set.

Physicians

Physicians (per 1,000 people)

World Health Organization · CC BY 4.0 · updated quarterly

Reported irregularly, so the latest value in the time window used is from a different year for different countries. Hospital beds, already on the site, have no "better" direction, since more beds is not plainly better. More doctors is closer to plainly better, so a direction is set on that basis.

How this was computed

Data used: most recent value in 2010-2025; values come from 2010–2023. To adjust for income, each measure is first predicted from GDP per person (in percentage terms, on a log scale) with a straight-line fit. Only what is left over is then compared. This is called a partial correlation. The line is drawn the standard way (ordinary least squares), which picks the line that comes closest to all the countries at once. The error margins allow for countries in the same region resembling each other, using 7 World Bank regions. The q-value corrects for testing all 12,497 pairs at once, using the Benjamini–Hochberg method. Underlying data last updated DYB 2024. How the country data works · explore One-person households and Physicians

This page shows that two measures go together. It does not show that One-person households changes Physicians, or the reverse. These figures also describe countries, not individual people. See the ecological fallacy.

More links with One-person households or Physicians