Table 2. Means and prevalences over time for surveyed health indicators; statistical test results can be inferred from confidence intervals.

Outcome	Survey	N of	Mean	95% CI
	(months)	values
IRON MEASURES
Haemoglobin	Baseline	354	122.1	119.8	124.4
(g/L)	3	574	126.4	125.0	127.8
	12	572	131.0	128.8	133.2
	30	303	130.3	128.3	132.3
Serum ferritin *	Baseline	334	28.1	24.1	32.7
(µg/L)	3	547	38.4	35.1	41.9
	12	556	44.7	41.1	48.6
	30	298	52.0	44.9	60.2
Soluble Tranferrin Receptor * (mg/L)	Baseline	341	1.7	1.6	1.8
	3	560	1.7	1.6	1.7
	12	569	1.4	1.3	1.5
	30	298	1.4	1.3	1.5
IRON STATUS
Anaemia	Baseline	354	38%	31%	45%
	3	574	27%	22%	32%
	12	572	20%	16%	24%
	30	303	19%	14%	24%
Iron deficiency	Baseline	334	19%	13%	25%
	3	547	8%	6%	10%
	12	556	6%	4%	8%
	30	298	6%	3%	9%
Iron-deficiency anaemia	Baseline	334	14%	10%	19%
	3	546	6%	4%	8%
	12	555	4%	2%	6%
	30	297	4%	1%	6%
INFECTIONS
Hookworm infection	Baseline	374	76%	68%	84%
	3	435	57%	50%	63%
	12	503	26%	21%	31%
	30	187	22%	12%	32%
A. lumbricoides	Baseline	374	20%	13%	26%
	3	435	6%	3%	9%
	12	503	4%	2%	6%
	30	187	4%	1%	7%
T. trichiura	Baseline	374	29%	24%	35%
	3	435	19%	14%	25%
	12	503	11%	7%	14%
	30	187	10%	4%	15%

*Geometric means.