Table 1.

Baseline descriptive statistics in the HALI trial. The total sample size includes $n=2230$ children in $N=101$ schools (137 participants have missing baseline spelling scores and excluded in the analysis).

Level	Variable		Overall	Intervention	Control
			(101 schools)	(51 schools)	(50 schools)
Child-level	log-Age	n	2230	1103	1127
		Min	1.6	1.6	1.6
		Mean	2.0	2.0	2.0
		Median	2.1	2.1	2.1
		IQR	1.9$~$2.2	1.9$~$2.2	1.9$~$2.2
		Max	2.7	2.7	2.6
		SD	0.22	0.21	0.22
	Sex	n	$2230\left(100\text{\%}\right)$	$1103\left(100\text{\%}\right)$	$1127\left(100\text{\%}\right)$
		Male	$1136\left(50.9\text{\%}\right)$	$575\left(52.1\text{\%}\right)$	$561\left(49.8\text{\%}\right)$
		Female	$1094\left(49.1\text{\%}\right)$	$528\left(47.9\text{\%}\right)$	$566\left(50.2\text{\%}\right)$
	Baseline spelling score	n	2193	1089	1104
		Min	0	0	0
		Mean	8.2	8.5	7.9
		Median	7	8	7
		IQR	$5~11$	$5~12$	$5~11$
		Max	20	20	19
		SD	4.50	4.66	4.33
School-level	Handwash facilities in school	N	$101\left(100\text{\%}\right)$	$51\left(100\text{\%}\right)$	$50\left(100\text{\%}\right)$
		Yes	$26\left(25.7\text{\%}\right)$	$17\left(33.3\text{\%}\right)$	$9\left(18.0\text{\%}\right)$
		No	$75\left(74.3\text{\%}\right)$	$34\left(66.7\text{\%}\right)$	$41\left(82.0\text{\%}\right)$