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Table 3 Results of the subgroup analyses

From: A photograph of the researcher on the invitation letter did not affect the participation rate of a postal survey: a randomized study within a trial (SWAT)

 

With photograph n (%)

Without photograph n (%)

P-value

Females

2506

2444

0.622

 Participants

390 (15.6)

368 (15.1)

 

 Non-Participants

2116 (84.4)

2076 (84.9)

 

Males

2383

2463

0.190

 Participants

288 (12.1)

292 (11.9)

 

 Non-Participants

2096 (87.9)

2171 (88.1)

 

Cities

1612

1612

0.809

 Participants

258 (16.0)

253 (15.7)

 

 Non-Participants

1354 (84.0)

1359 (84.3)

 

Towns and suburbs

1633

1650

0.241

 Participants

186 (11.4)

167 (10.1)

 

 Non-Participants

1447 (88.6)

1483 (89.9)

 

Rural areas

1645

1645

0.646

 Participants

217 (13.2)

226 (13.7)

 

 Non-Participants

1428 (86.8)

1419 (86.3)

 
  1. Participants from 3 population registration offices needed to be removed from this analysis as age was not transmitted from these