Skip to main content

Table 1 Numbers in the study and reply and response rate, for each time period, by sampling design

From: Does population screening for Chlamydia trachomatisraise anxiety among those tested? Findings from a population based chlamydia screening study

 

Time Period

 

Before invitation

At invitation

After receipt of negative result

 

Number sent

Number returned (%)

Number sent

Number returned (%)

Number sent

Number returned (%)

Questionnaire reply rates a

      

Cohort

687

297 (43%)

680

177 (26%)

172

126 (73%)

Cross-sectional

624

250 (40%)

763

241 (32%)

146

101 (69%)

All

1311

547 (42%)

1443

418 (29%)

318

227 (71%)

Analysis response rates b

      

Cohort

186

113 (61%)

186

168 (90%)

172

126 (73%)

Cross-sectional

175

105 (60%)

244

229 (94%)

146

101 (69%)

All

361

218 (60%)

430

397 (92%)

318

227 (71%)

  1. a. Denominator: all individuals to whom questionnaires were posted.
  2. Numerator: all those who replied regardless of their chlamydia test result and regardless of their inclusion in the case-control study.
  3. b. Denominator: all individuals with a negative test result and not included in the case-control study.
  4. Numerator: of these individuals, those who responded.