Table 3. Anorectal chlamydia and association with different variables

Variables	n	Rectal CT(%)	Univariate analysisOR (95 %CI)	P value	Multivariate analysisOR (95% CI)	P value
Standard indication for rectal testing	208	(11.1)	0.54 (0.32 to 0.92)	0.023*
Experimental indication for rectal testing	406	(14.8)	0.76 (0.41 to 1.42)	0.40
Anal symptoms	98	(12.2)	0.72 (0.37 to 1.39)	0.35
Anal sex	138	(10.9)	0.59 (0.32 to 1.07)	0.10
Anal sex without penetration	230	(12.6)	0.67 (0.41 to 1.12)	0.13
Anal sex with penetration	103	(7.8)	0.40 (0.19 to 0.86)	0.020*	0.64 (0.28 to 1.47)	0.29
Anal contact with fingers	185	(9.2)	0.43 (0.24 to 0.76)	0.003*	0.58 (0.31 to 1.11)	0.10
Anal contact with toys	34	(5.9)	0.33 (0.08 to 1.42)	0.14
Oral contact with genitals	352	(15.6)	1.09 (0.62 to 1.92)	0.89
Oral contact with anus	91	(7.7)	0.40 (0.18 to 0.91)	0.024*	0.69 (0.29 to 1.66)	0.41
Age, years^a
≤21	104	(30.8)
22–28	220	(14.5)	0.38 (0.22 to 0.67)	0.001*	0.40 (0.23 to 0.71)	0.002*
>28	163	(6.7)	0.16 (0.08 to 0.34)	<0.001*	0.20 (0.09 to 0.41)	<0.001*

^aAge ≤21 years was the reference category. n is the total number positive for the variable, excluding 10 women without a rectal CT test. The rectal CT positive (%) was calculated by excluding women with a missing answer (0–5 per question). Women answering 'don’t know' were added to the 'no' category when calculating odds ratios and Fisher’s exact P values. Significant P values ≤0.05 are indicated by asterisk (*). Only possible risk-factor variables (below the double line) were analysed with logistic regression if significantly associated with rectal CT in the univariate analysis. CT = Chlamydia trachomatis