Table 4.

Crude and Adjusted Associations Between Partnership Characteristics and Log of Mean Inter-partner Difference

	Na	Inter-Partner Agreement, First Sexual Intercourse				Inter-Partner Agreement, Last Sexual Intercourse
		Mean daysb	Geometric mean daysb	Ratio of geometric means, crude (95% CI)	Ratio of geometric means, adjusted (95% CI)	Mean daysb	Geometric mean daysb	Ratio of geometric means, crude (95% CI)	Ratio of geometric means, adjusted (95% CI)
Model intercept					2.15
Recall intervalc
0–4 Months	36	279	26	Ref	Ref
8–12 Months	112	261	58	2.3 (1.1, 4.9)*	1.4 (0.6, 3.3)
Duration of partnership (β,1-year)				1.5 (1.1, 1.8)***	1.5 (1.3, 1.8)***			1.0 (0.9, 1.1)	1.0 (0.9, 1.1)
Difference in age (β, 1-year)				1.0 (1.0, 1.1)	1.0 (1.0, 1.1)			1.0 (1.0, 1.0)	1.0 (1.0, 1.0)
Mean absolute difference in reported sex frequency, past 4 months (β, 1-act)				1.0 (1.0, 1.0)	1.0 (1.0, 1.0)			1.0 (1.0, 1.0)	1.0 (1.0, 1.0)
Monogamy, past 4 months
Mutually monogamous	95	242	46	Ref	Ref	4	2	Ref	Ref
One partner non-monogamous	28	286	59	1.3 (0.5, 3.1)	2.5 (1.1, 6.1)*	7	3	1.3 (0.8, 2)	1.2 (0.8, 1.9)
Both partners non-monogamous	26	322	36	0.8 (0.3, 1.9)	1.2 (0.5, 3.0)	15	6	2.7 (1.7, 4.3)***	2.8 (1.7, 4.5)***
STD ever, index or partner
No	88	226	38	Ref	Ref	5	3	Ref	Ref
Yes	63	315	63	1.7 (0.9, 3.3)	1.2 (0.7, 2.4)	8	3	1.2 (0.8, 1.8)	1.2 (0.9, 1.8)
AOD use before or during sex, index or partner
No	47	386	64	Ref	Ref	9	4	Ref	Ref
Yes	103	212	41	0.6 (0.3, 1.3)	0.9 (0.5, 1.8)	5	3	0.7 (0.5, 1.1)	0.9 (0.6, 1.3)

^*P<0.05

^**P<0.01

^***P<0.001

^aCorresponds to dyads with complete, non-missing data for covariates and dates of first [last] sexual intercourse.

^bArithmetic and geometric mean number of days between index and partner’s reports on date of intercourse. Geometric means estimated using regression.

^cRecall interval represents the time between index and partner participants being asked about date of first sex.