Table 4.

Risk factors by age group independently associated with N. meningitidis carriage in multiple logistic regression.

Age group	Model section	Characteristics	p-value	Odds ratio (OR)a	95% CI of OR
					LL	UL
1–4 years	Saturated model	Number of household members	0.2993	1.135	0.894	1.441
		Gender (female vs male)	0.6136	0.777	0.292	2.070
		Day care centers (private vs public)	0.7688	0.659	0.041	10.656
		Vaccination status (yes vs no)	0.1340	0.480	0.184	1.254
		Previous antibiotic usage (yes vs no)	0.8837	1.079	0.389	2.991
	Final model	Previous antibiotic usage (yes vs no)	0.8751	0.923	0.340	2.504
5–9 years	Saturated model	Number of household members	0.3581	1.129	0.872	1.462
		Gender (female vs male)	0.9909	1.006	0.382	2.649
		Previous antibiotic usage (yes vs no)	0.4675	0.564	0.120	2.642
	Final model	Nil
10–14 years	Saturated model	Number of household members	0.1570	1.179	0.939	1.480
		Gender (female vs male)	0.1193	2.155	0.820	5.660
		Scholarity level (secondary vs basic)	0.7926	1.149	0.408	3.239
		Scholarity level (high school vs basic)	0.9833	0.000	< 0.001	.
	Final model	Number of household members	0.1590	1.179	0.937	1.484
		Gender (female vs male)	0.1245	2.128	0.812	5.574
15–19 years	Saturated model	Number of household members	0.0186	1.349	1.051	1.731
		Gender (female vs male)	0.9336	1.051	0.324	3.414
		Employment (informal vs formal)	0.5018	2.173	0.226	20.926
		Vaccination status (yes vs no)	0.0702	15.240	0.799	290.845
		Previous antibiotic usage (yes vs no)	0.5268	0.564	0.095	3.327
	Final model	Number of household members	0.0316	1.301	1.023	1.653
		Vaccination status (yes vs no)	0.0349	14.998	1.212	185.593
20–24 years	Saturated model	Number of household members	0.1871	0.751	0.491	1.149
		Gender (female vs male)	0.7601	0.818	0.225	2.972
		Monthly family per capita income (medium vs low)	0.8753	1.137	0.229	5.632
		Employment (informal vs formal)	0.3723	2.052	0.423	9.955
	Final model	Number of household members	0.1500	0.744	0.497	1.113

95% CI, 95% confidence interval of odds ratio; LL, lower limit; UL, upper limit.

Note 1: Final model is based on the backward elimination strategy using logistic regression with SLSTAY = 0.20; Note 2: some of the independent variables were not included in the model due to lack of observations.

^aAdjusted odds ratio.