Table 4

Multivariate model of INA-level, couple-level and invitation-level characteristics associated with couples’ testing

	All couples				Cohabiting couples				Non-cohabiting couples
	OR	95% CI		p Value	OR	95% CI		p Value	OR	95% CI		p Value
INA characteristics
Network
Private	Ref				Ref				Ref
Religious	1.01	0.71	1.43	0.95	1.01	0.73	1.40	0.94	1.16	0.49	2.77	0.74
Health	1.53	1.15	2.04	0.004	1.48	1.11	1.97	0.01	1.80	0.96	3.35	0.07
CBOs/NGOs	1.34	1.01	1.77	0.04	1.31	0.98	1.76	0.07	1.53	0.84	2.79	0.16
Years living in Lusaka	1.01	1.00	1.02	0.14	1.01	1.00	1.02	0.07	1.01	0.99	1.04	0.24
Age (per 1 year increase)	1.00	0.99	1.02	0.79	1.00	0.99	1.02	0.53	0.99	0.97	1.01	0.35
Marital status
Other (divorced, widowed, single)	Ref				Ref				Ref
Married	1.23	0.99	1.53	0.06	1.28	1.02	1.60	0.03	1.06	0.70	1.62	0.77
Occupation
Unskilled manual labour	Ref				Ref				Ref
Professional	1.19	0.77	1.84	0.45	1.06	0.69	1.64	0.79	1.98	0.92	4.27	0.08
Sales/service	1.45	1.01	2.10	0.05	1.37	0.94	1.99	0.11	1.67	0.88	3.19	0.12
Agricultural	1.14	0.65	2.01	0.64	0.97	0.55	1.72	0.93	1.68	0.60	4.67	0.32
Do not work for money	0.95	0.62	1.45	0.81	0.95	0.62	1.45	0.80	0.69	0.26	1.82	0.45
Reads English
No	Ref				Ref				Ref
Yes	1.18	0.90	1.55	0.22	1.15	0.87	1.51	0.32	1.98	1.05	3.72	0.03
Housing
Other housing (rental, free)	Ref				Ref				Ref
Own home	0.74	0.59	0.92	0.01	0.73	0.58	0.91	0.01	0.93	0.62	1.38	0.71
Ever tested for HIV
No	Ref				Ref				Ref
Yes with partner	1.36	1.07	1.72	0.01	1.29	1.01	1.66	0.04	2.13	1.27	3.57	0.004
Yes alone	1.28	1.00	1.64	0.05	1.21	0.94	1.56	0.15	1.92	1.10	3.35	0.02
Couple characteristics
Age of man (per 1 year increase)	1.00	1.00	1.01	0.30	1.01	1.00	1.02	0.10	1.03	1.00	1.05	0.02
Years of relationship (per 1 year increase)	1.01	0.99	1.02	0.35	1.02	1.01	1.03	<0.001	0.45	0.37	0.55	<0.001
Relationship of couple					n/a				n/a
Not cohabiting	Ref
Cohabiting	1.39	1.19	1.63	<0.001
Invitation characteristics
Invitee (1st contact)
Individual (woman/man)	Ref				Ref				Ref
Couple	1.20	1.04	1.39	0.01	1.27	1.09	1.49	0.003	0.82	0.52	1.28	0.38
Who initiated contact?
INA	Ref				Ref				Ref
Couple	1.35	1.03	1.78	0.03	1.43	1.05	1.94	0.02	0.94	0.27	3.20	0.92
Man	1.22	0.89	1.67	0.22	1.26	0.90	1.75	0.18	1.00	0.47	2.12	1.00
Woman	1.60	1.17	2.19	0.003	1.53	1.10	2.12	0.01	1.54	0.73	3.27	0.26
Relationship to INA
Just met/unknown	Ref				Ref				Ref
Co-worker	1.48	0.89	2.43	0.13	1.47	0.84	2.55	0.18	1.11	0.27	4.56	0.89
Social acquaintance (neighbour, friend, church member, family)	1.62	1.41	1.87	<0.001	1.60	1.37	1.87	<0.001	1.60	1.15	2.24	0.01
Place of invitation
Other (community or couple/INA work)	Ref				Ref				Ref
Couple or INA home	1.30	1.14	1.48	<0.001	1.39	1.21	1.61	<0.001	0.93	0.68	1.27	0.65
Delivering invitation
Difficult/somewhat difficult	Ref				Ref				Ref
Easy	1.75	1.41	2.17	<0.001	1.87	1.47	2.37	<0.001	1.15	0.67	1.99	0.61

INA, influential network agent.