Table 4

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

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


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.

Scott et al. BMC Medical Research Methodology 2011 11:126   doi:10.1186/1471-2288-11-126

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