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Table 2 Prevalence estimates and standardized distances to the reference population for external covariates

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
Professional status (Labor Survey) (1)   8.0 7.8
 Employed 58.7% −6.1 −4.3
 Student 5.0% 9.2 8.0
 Unemployed 6.2% 11.6 12.0
 Retired/inactive 30.2% −5.3 −6.9
Socio-professional group (Labor Survey) (2)   2.9 2.8
 Farmer 1.7% 0.8 0.8
 Craftsperson, tradesperson, business owner 6.3% 0.0 2.4
 Executive 17.2% −7.1 −6.3
 Intermediate occupations 25.1% −1.9 −1.9
 Technicians 27.9% 3.1 2.7
 Blue-collar worker 21.8% 4.5 3.1
Visit to a family physician in the last year (Health Insurance) (3)   6.6 8.2
 Yes 85.5% −6.6 −8.2
 No 14.5% 6.6 8.2
Mean D (1) (2) (3) 5.8 6.3
  1. Boldface entries correspond to results summed up at the variable level or to global distribution of the sample (mean D, R-indicator)