Skip to main content

Table 4 The effect of mode on response rates (probit regression model)

From: A randomised trial and economic evaluation of the effect of response mode on response rate, response bias, and item non-response in a survey of doctors

  All doctors GPs Specialists Hospital non-specialists Specialists in training
  Marginal effects (standard error)
Simultaneous mixed 0.070*** 0.028 0.160*** 0.034 -0.030
  (0.020) (0.030) (0.036) (0.046) (0.060)
Sequential mixed 0.077*** 0.053 0.133*** 0.072 0.013
  (0.020) (0.028) (0.037) (0.049) (0.065)
< age30 0.074 0.086 - 0.276 0.108
  (0.046) (0.156) - (0.160) (0.166)
age30-39 0.037 -0.008 0.029 0.229 0.198*
  (0.027) (0.040) (0.048) (0.163) (0.085)
age50-59 0.054* 0.039 0.058 0.418 0.009
  (0.023) (0.031) (0.036) (0.245) (0.144)
age60-69 0.002 0.020 -0.018 - -
  (0.026) (0.038) (0.038)   
> = age70 -0.028 -0.063 0.005 - -
  (0.035) (0.042) (0.058)   
Age missing -0.037 -0.034 -0.080* 0.208 0.127
  (0.025) (0.036) (0.039) (0.190) (0.125)
Female -0.043** -0.029 -0.066 -0.048 -0.080
  (0.017) (0.024) (0.036) (0.037) (0.056)
Specialist 0.053** - - - -
  (0.018)     
Hospital non-specialist -0.013 - - - -
  (0.027)     
Specialist in training 0.009 - - - -
  (0.032)     
Inner Regional 0.025 0.024 0.053 -0.050 0.140
  (0.023) (0.030) (0.045) (0.054) (0.105)
Outer Regional 0.051 0.119* -0.056 - -
  (0.040) (0.052) (0.064)   
Remote 0.231 0.354 - - -
  (0.182) (0.249)    
Very Remote 0.517** 0.542** - 0.459 -
  (0.163) (0.185)   (0.315)  
N 2702 1091 966 430 196
Log likelihood -1255 -469 -461 -188 -84
χ2 (df) 59.7*** (16) 28.3** (13) 37.4*** (10) 12.6 (9) 11.3 (8)
Pseudo R2 0.03 0.03 0.04 0.04 0.05
  1. Marginal effects for discrete change of dummy variable from 0 to 1; * P < 0.05, ** P < 0.01, *** P < 0.001; standard errors are in parentheses.