Table 2.

Study attrition in total and within each surveillance arm

	Total (N=4382) n (%)	Surveillance
		Active (N=2215) n (%)	Passive (N=2167) n (%)	OR (95% CI)*
					Death	120 (2.7)	49 (2.2)	71 (3.3)	0.68 (0.47 to 0.98)
Lost to follow-up	98 (2.2)	38 (1.7)	60 (2.8)	0.62 (0.41 to 0.94)
With drawn	204 (4.7)	93 (4.2)	111 (5.1)	0.84 (0.63 to 1.11)
Children completing the study	3960 (90.4)	2035 (91.9)	1925 (88.8)	1.24 (0.94 to 1.63)

Data are shown as number and percentages within parenthesis.

*OR and 95% CI estimates of the effect of active surveillance corrected for cluster-specific random effects and the fixed effects of gender, religion, father’s education and fuel applying mixed-effects logistic regression are shown. Significant differences are bolded.