Table 1.

Distribution of infant deaths per family, rural Nouna Health and Demographic Surveillance System, 1993–2009

No. of live births per family		Infant deaths per family						No. of families	Infant deaths	${\text{χ}}^2$	Mortality risk per 1,000
		0	1	2	3	4	$\ge 2$*
1	OBS	1,305	46	–	–	–	–	1,351	46	–	34.1 (24.4–43.7)
	EXP	1,305.0	46.0	–	–	–	–
2	OBS	801	72	5	–	–	5	878	82	5.5	46.7 (36.8–56.6)
	EXP	798.0	78.1	1.9	–	–	1.9
3	OBS	532	99	7	0	–	7	638	113	0.1	59.0 (48.5–69.6)
	EXP	531.5	100.2	6.3	0.0	–	6.3
4	OBS	317	61	11	1	0	12	390	86	6.9	55.1 (43.8–66.5)
	EXP	310.9	72.6	6.3	0.2	0.0	6.5
5	OBS	226	42	8	1	1	10	278	65	7.0	46.8 (35.7–57.9)
	EXP	218.8	53.7	5.3	0.2	0.0	5.5
6	OBS	87	26	9	0	0	9	122	44	4.2	60.1 (42.9–77.3)
	EXP	84.1	32.3	5.2	0.4	0.0	5.6
7–10	OBS	43	22	6	0	0	6	71	34	2.4	65.8 (44.4–87.1)
	EXP	47.3	19.8	3.5	0.4	0.0	3.9
Total	–	3,311	368	46	2	1	49	3,728	470	26.1	51.0 (46.5–55.5)

OBS = observed number of infant deaths; EXP = Expected number of infant deaths; estimated by binominal distribution given row total. ${\text{χ}}^2$ test based on entries in shaded cells.

* Combined groups with $\ge 2$ deaths for calculating the ${\text{χ}}^2$ statistics.