Table 2.

Factors affecting time to colour change of the menstrual cup, as observed during visits to the study nurse, Western Kenya, 2012–2013

Variable	n	Univariate Hazard ratio, 95% CIa	p-value	Multivariate Hazard ratio, 95% CIa	p-value
Class at time of enrolment
5 or 6	61	0.73, 0.57–0.94	0.013	NS
7 or 8	131	Reference
Age at enrolment (years)
14	93	Reference		NS
15	80	1.17, 0.88–1.56	0.268
16	19	3.81, 1.59–9.14	0.003
Socio-economic status household of girls
Poorest 2 quintiles	22	1.12, 0.73–1.72	0.589	Not included
Higher 3 SES quintiles	138	0.90, 0.70–1.15	0.410
No information	32	Reference
Material used for menstruation before enrolment
Used some pads	169	Reference		Not included
Cloths/other	23	0.92, 0.48–1.73	0.788
Time since menarche at enrolment
< 1 year	51	1.01, 0.63–1.62	0.958	Not included
≥ 1 year	141	Reference
Enrolment year
2012	126	Reference		Reference
2013	66	3.93, 2.09–7.38	< 0.001	3.93, 2.09–7.38	< 0.001
Enrolled before/after peer educationb
Before peer education	102	Reference		NS
After peer education	90	2.77, 1.25–6.13	0.012

CI confidence interval, NS not significant in multivariate model

Note: a hazard ratio > 1 indicates a shorter duration to cup colour change

^aSchool included as cluster variable

^bPeer-to-peer classroom training conducted by ‘champion’ secondary schoolgirls from a school in a contiguous area in October 2012