Table 3.

Independent samples t-test for comparison of Z scores in food-secure and food-insecure subjects (mean and sd values)

Characteristics	Food-secure		Food-insecure		t	df	P-value
	Mean ± sd		Mean ± sd
	Mean	sd	Mean	sd
Birth weight (cm)	3247	431	3218	456	−1·5	2479	0·054
Birth height (cm)	49·96	2·25	49·88	2·49	−0·76	2453	0·057
Birth head circumference (cm)	34·75	1·68	34·72	1·86	−0·52	2436	0·177
Birth WHZ	−0·40	1·17	−0·40	1·20	0·04	1893	0·971
2-month WHZ	−0·05	1·12	0·00	1·14	1·14	2375	0·254
4-month WHZ	−0·05	1·12	0·02	1·05	1·32	2310	0·186
6-month WHZ	0·10	1·10	0·09	1·06	−0·33	1854	0·745
Birth WAZ	−0·16	0·87	−0·21	0·94	−1·22	1234	0·221
2-month WAZ	0·09	0·98	0·01	1·03	−1·83	2367	0·067
4-month WAZ	0·18	1·02	0·10	1·01	−1·79	2311	0·073
6-month WAZ	0·27	1·02	0·12	1·01	−2·92	1848	0·003
Birth HAZ	−0·08	1·05	−0·16	1·11	−1·56	1891	0·120
2-month HAZ	0·24	1·17	0·05	1·25	−3·59	2379	<0·001
4-month HAZ	0·40	1·08	0·23	1·12	−3·46	2311	0·001
6-month HAZ	0·47	1·09	0·23	1·10	−4·43	1853	<0·001

HAZ, height-for-age Z scores; WAZ, weight-for-age Z scores; WHZ, weight-for-height Z scores.

P < 0·05 considered statistically significant.