Table 1

Factors associated with retesting and retest rate with regard to chlamydia retesting in 10 participating sexually transmitted infection (STI) clinics in the Netherlands, May 2012–May 2013

Factors (measured at T0)	N invited (%)	n response	Retest rate % (95% CI)	Univariate Cox regression PR (95% CI)	Multivariate Cox regression PR (95% CI)*
Total	828	275	33.2
Gender
Male	228 (27.5)	56	24.6 (18.9 to 30.2)	1.0	1.0
Female	600 (72.5)	219	36.5 (32.6 to 40.4)	1.5 (1.1 to 2.0)	1.4 (1.0 to 1.9)
Age (years)
16–19	290 (35.0)	97	33.4 (28.0 to 38.9)	1.0 (0.8 to 1.3)	nt
20–23	538 (65.0)	178	33.1 (29.1 to 37.1)	1.0
Ethnicity
Dutch	704 (85.0)	246	34.9 (31.4 to 38.5)	1.5 (1.0 to 2.2)	1.4 (1.0 to 2.1)
Non-Dutch	124 (15.0)	29	23.4 (15.8 to 30.9)	1.0	1.0
Notified by partner
Yes	218 (26.3)	50	22.9 (17.3 to 28.6)	0.6 (0.5 to 0.8)	0.6 (0.5 to 0.9)
No	610 (73.7)	225	36.9 (33.0 to 40.7)	1.0	1.0
STI-related symptoms†
Yes	265 (32.0)	86	32.5 (26.8 to 38.1)	1.0 (0.8 to 1.3)	nt
No	552 (66.9)	184	33.2 (29.3 to 37.1)	1.0
Residence†
City	434 (52.4)	157	36.2 (31.6 to 40.7)	1.2 (1.0 to 1.6)	1.2 (0.9 to 1.5)
Rural	368 (44.4)	109	29.6 (24.9 to 34.3)	1.0	1.0
No of partners <6 months
0–2	505 (61.0)	161	35.3 (30.1 to 40.5)	1.0	nt
≥3	323 (39.0)	114	31.9 (27.8 to 36.0)	1.1 (0.9 to 1.4)
Condom use during the last sexual contact†
Yes	143 (17.3)	48	33.6 (25.7 to 41.4)	1.0 (0.7 to 1.4)
No	683 (82.5)	226	33.1 (29.6 to 36.6)	1.0	nt

nt, not tested in multivariate model, since p>0.20 in univariate analysis.
In bold: significant (p<0.05); due to rounding to one decimal place, 1.0 is not always significant.
*Adjusted for gender, ethnicity, notified by partner and urbanisation.
†Determinant contains missings.
PR, prevalence ratio.