Table 4. Comparison of the mean probability of participation in a syphilis PN program (range 0–1) between infected patient and sex partner of the infected patient participant groups by levels of independent variables.

Independent variable	If the respondent was the infected patient		If the respondent was the sex partner of the infected patient
	Mean	± SD	Mean	± SD
PN referral method
Patient referral	0.6411	0.3113	0.6566	0.3068
Anonymous health care worker	0.6339	0.3276	0.6110	0.3440
Anonymous CBO	0.6594	0.3345	0.6378	0.3302
Contact method
Short message service	0.6760	0.3049	0.6554	0.3184
E-mail	0.6494	0.3269	0.6479	0.3274
Instant message	0.6322	0.3373	0.6267	0.3314
Phone call	0.6238	0.3296	0.6096	0.3345
Face-to-face	0.6358	0.3075	0.6580	0.3049
Partner follow-up location
Public STD clinic	0.6928	0.2997	0.6638	0.3117
Private clinic	0.5573	0.3542	0.5527	0.3479
MSM CBO	0.6276	0.3345	0.6505	0.3269
Local CDCa	0.6997	0.2833	0.6787	0.3040

^aCenter for Disease Control and Prevention