Table 1.
Socio-demographic characteristics of the study sample
| Total | Sample 1 | Sample 2 | P | ||||
|---|---|---|---|---|---|---|---|
| Frequency (%) | Frequency (%) | Frequency (%) | |||||
| n | % | n | % | n | % | ||
| Gender | |||||||
| Male | 270 | 33·5 | 131 | 3·4 | 139 | 34·6 | 0·518 |
| Female | 536 | 66·5 | 273 | 67·6 | 263 | 65·4 | |
| Marital status | |||||||
| Single | 533 | 67·0 | 263 | 66·1 | 270 | 67·8 | 0·395 |
| Married | 230 | 28·9 | 120 | 30·2 | 110 | 27·6 | |
| Widowed | 11 | 1·4 | 7 | 1·8 | 4 | 1·0 | |
| Divorced | 22 | 2·8 | 8 | 2·0 | 14 | 3·5 | |
| Education level | |||||||
| Primary | 24 | 3·1 | 11 | 2·8 | 13 | 3·3 | 0·760 |
| Complementary | 61 | 7·8 | 34 | 8·7 | 27 | 6·9 | |
| Secondary | 125 | 15·9 | 60 | 15·3 | 65 | 16·6 | |
| University | 574 | 73·2 | 288 | 73·3 | 286 | 73·1 | |
| Monthly income | |||||||
| No income | 340 | 45·1 | 168 | 44·4 | 172 | 45·7 | 0·140 |
| <1000 USD | 247 | 32·8 | 121 | 32·0 | 126 | 33·5 | |
| 1000–2000 USD | 117 | 15·5 | 56 | 14·8 | 61 | 16·2 | |
| >2000 USD | 50 | 6·6 | 33 | 8·37 | 17 | 4·5 | |
| Smoking | |||||||
| Yes | 246 | 30·8 | 127 | 31·7 | 119 | 29·8 | 0·572 |
| No | 554 | 69·2 | 274 | 68·3 | 280 | 70·2 | |
| Alcohol | |||||||
| Yes | 32 | 4·2 | 12 | 3·1 | 20 | 5·4 | 0·124 |
| No | 724 | 95·8 | 372 | 96·9 | 352 | 94·6 | |
| Caffeinated beverages | |||||||
| Yes | 721 | 90·0 | 362 | 90·5 | 359 | 89·5 | 0·646 |
| No | 80 | 10·0 | 38 | 9·5 | 42 | 10·5 | |
| Practicing sport activities | |||||||
| Yes | 490 | 62·4 | 248 | 63·6 | 242 | 61·3 | 0·501 |
| No | 295 | 37·6 | 142 | 36·4 | 153 | 38·7 | |
| Age (in years) | 0·354 | ||||||
| Mean | 27·59 | 27·96 | 27·19 | ||||
| sd | 11·76 | 11·83 | 11·68 | ||||
| BMI (kg/m2) | 0·182 | ||||||
| Mean | 24·35 | 24·10 | 24·60 | ||||
| sd | 5·28 | 4·98 | 5·55 | ||||
The χ 2 and Fisher exact tests were used to evaluate the association between categorical variables, and the Mann–Whitney test was used to evaluate the association between the age, body mass index (BMI) and the sample group.