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Table 1 Distribution of calibration covariates in the reference population and standardized distances

From: Moving towards a single-frame cell phone design in random digit dialing surveys: considerations from a French general population health survey

  Reference population
(%)
Dual-frame: Combined
(d*)
Single-frame: Cell phone
(d*)
Sample size   25,319 15,602
Sex   5.6 3.0
 Male 48.7% −5.6 −3.0
 Female 51.3% 5.6 3.0
Age (years)   2.0 2.7
 18–24 11.2% −2.3 1.3
 25–34 17.1% 0.5 5.2
 35–44 18.5% −2.3 0.8
 45–54 19.5% −1.5 −0.3
 55–64 18.2% 2.6 0.5
 65–75 15.5% 2.7 −8.1
Education level   10.3 13.1
 Primary education 13.3% −19.8 −22.9
 Less than high school 35.4% −8.9 −14.6
 High school graduate 20.4% 3.2 5.6
 2 years post-secondary 12.8% −0.6 1.8
 3–4 years post-secondary 7.6% 22.4 24.1
 ≥ 5 years post-secondary 10.5% 6.6 9.5
Size of household   7.4 5.0
 1 person 17.4% 14.7 12.3
 2 persons 34.2% 2.5 −2.3
 3 persons 18.9% −6.0 − 2.3
 4 persons 19.3% −8.4 −5.4
 ≥ 5 persons 10.2% −5.5 −2.7
Urbanization   2.6 2.5
 Rural 24.0% 2.3 −2.8
 <  20,000 inhabitants 16.8% −0.8 −1.9
 20,000–99,999 inhabitants 12.1% 2.1 1.8
 100,000–199,999 inhabitants 4.9% 4.4 4.8
 ≥ 200,000 inhabitants 25.7% −4.2 −1.4
 Paris agglomeration 16.6% −1.9 2.1
Region of residence   1.7 1.7
 Ile-de-France 19.0% −2.8 1.6
 Grand-Est 8.6% −0.4 −1.9
 Hauts-de-France 9.3% −2.5 − 2.4
 Normandie 5.1% 1.3 −0.8
 Centre 4.0% −1.0 −2.1
 Bourgogne-Franche-Comté 4.4% −0.5 −1.7
 Bretagne 5.1% 3.9 3.2
 Pays de Loire 5.7% −0.9 −2.6
 Nouvelle Aquitaine 9.2% 1.0 0.9
 Auvergne-Rhône-Alpes 12.2% 3.0 1.8
 Occitanie 9.1% 1.4 1.5
 PACA and Corse 8.3% −1.5 0.2
Mean D 4.9 4.7
R-indicator without interactions 0.85 0.89
  1. Boldface entries correspond to results summed up at the variable level or to global distribution of the sample (mean D, R-indicator)