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Table 1 Expected number of participants per STI clinic at each follow-up moment

From: Study protocol of the iMPaCT project: a longitudinal cohort study assessing psychological determinants, sexual behaviour and chlamydia (re)infections in heterosexual STI clinic visitors

STI clinic

Expected number of participants

Baseline (men/women)

Baseline Ct+

Three-week

Six-month

Six-month Ct+

One-year

Twente

400 (160/240)

60

320

193

31

120

Hollands Noorden

400 (160/240)

60

320

193

31

120

Kennemerland

400 (160/240)

60

320

193

31

120

Amsterdam

800 (320/480)

120

640

385

62

240

Total

2000 (800/1200)

300

1600

964

155

600

  1. Abbreviations: Ct+ chlamydia positive