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Table 2
Socio-economic characteristics of the subjects
	All		Male		Female
	n	%¹	n	%¹	n	%¹

Physiological factors

Sex	1019
Male	432	50.3
Female	587	49.7
Age (years)	1019
15 y.	225	22.5	91	21.3	134	23.8
16 y.	211	19.8	101	22.1	110	17.5
17 y.	204	20.1	84	18.8	120	21.4
18 y.	242	22.8	90	21.4	152	24.1
19 y.	137	14.8	66	16.4	71	13.2
Environment

Region	1019
District of Tunis	228	35.1	100	35.9	128	34.2
Middle Eastern	376	39.5	161	38.6	215	40.4
Middle Western	415	25.4	171	25.5	244	25.4
Milieu	1019
Urban	566	67.4	246	67.6	320	67.2
Rural	453	32.6	186	32.4	267	32.8
Socio-economic factors

Economic level of the household	972
Upper tercile	248	33.6	182	36.2	231	33.2
Intermediate tercile	311	31.6	115	27.8	196	35.5
Lower tercile	413	34.8	119	35.9	129	31.2
Profession of head of household	1004
Upper/intermediate	271	28.7	120	31.1	151	26.3
Employee/worker	590	56.0	340	52.5	350	59.5
Not working/Retired	143	15.3	65	16.4	78	14.2
Education of head of household	1007
Secondary/University	317	37.1	133	36.3	184	38.0
Primary school or none	190	62.9	292	63.7	398	62.0
Mother working outside the home	1015
Yes	131	14.9	56	13.7	75	16.2
No	884	85.1	375	83.6	509	83.8
Education of mother	1005
Secondary/University	168	21.9	74	22.6	94	21.2
Primary school or none	837	78.1	350	77.4	487	78.8
Currently attending school	1015
Yes	683	70.8	295	70.2	388	71.4
No	332	29.2	136	29.8	196	28.6

1- Weighted percentages.
Aounallah-Skhiri et al. Nutrition Journal 2011 10:38 doi:10.1186/1475-2891-10-38

Table 2