PrEP	pre-exposure prophylaxis
STI	sexually transmitted infection
ROC	receiver operating characteristic
CVI	content validity index
AIDS	acquired immunodeficiency syndrome
HIV	human immunodeficiency virus
VOICE trial	Vaginal and Oral Interventions to Control the Epidemic trial
FEM-PrEP trial	the Preexposure Prophylaxis Trial for HIV Prevention among African Women
iPrEx trial	the Preexposure Prophylaxis Initiative
Partner PrEP Study	Partners Preexposure Prophylaxis
UNAIDS	Joint United Nations Program on HIV/AIDS
I-CVI	item-level content validity index
S-CVI	scale-level content validity index
EFA	exploratory factor analysis
CFA	confirmatory factor analysis
KMO value	Kaiser-Meyer-Olkin value
df	degrees of freedom
RMSEA	root mean square error of approximation
GFI	goodness-of-fit index
AGFI	adjusted goodness-of-fit index
CFI	comparative fit index
AVE	average variance extracted
CR	construct reliability
AUC	the area under the receiver operating characteristic curve