Table 2.
Bivariate analysis. Distribution of hours of sleep among primary-school children by socio-demographic and lifestyle variables.
| Modalities | Hours of sleep | Chi sq. test p | ||
|---|---|---|---|---|
| <10 h % (n) | ≥10 h % (n) | |||
| Variables concerning the child | ||||
| Sex | Females | 54.03 (67) | 45.96 (57) | 0.3126 |
| Males | 61.07 (80) | 38.93 (51) | ||
| Age | 6 years old | 57.08 (129) | 42.92 (97) | 0.6454 |
| 7 years old | 62.86 (22) | 37.14 (13) | ||
| Prosocial behavior | First tertile | 61.54 (24) | 38.46 (15) | 0.9211 |
| Second tertile | 58.06 (54) | 41.94 (39) | ||
| Third tertile | 58.06 (72) | 41.94 (52) | ||
| Peer problems | First tertile | 52.68 (59) | 47.32 (53) | 0.3642 |
| Second tertile | 61.16 (34) | 35.85 (19) | ||
| Third tertile | 58.33 (49) | 41.67 (35) | ||
| Hyperactivity | First tertile | 57.14 (16) | 42.86 (12) | 0.9826 |
| Second tertile | 58.16 (82) | 41.84 (59) | ||
| Third tertile | 59.04 (49) | 40.96 (34) | ||
| Conduct problems | First tertile | 53.70 (29) | 46.30 (25) | 0.7645 |
| Second tertile | 57.03 (73) | 42.97 (55) | ||
| Third tertile | 60.29 (41) | 39.71 (27) | ||
| Emotional symptoms | First tertile | 47.14 (33) | 52.86 (37) | 0.08373 |
| Second tertile | 60.00 (72) | 40.00 (48) | ||
| Third tertile | 65.15 (43) | 34.85 (23) | ||
| Siblings | Yes | 58.64 (112) | 41.36 (79) | 0.7101 |
| No | 55.07 (38) | 44.93 (31) | ||
| Sport | Yes | 55.77 (116) | 44.23 (92) | 0.272 |
| No | 65.38 (34) | 34.62 (18) | ||
| BMI | <25 kg/m2 | 59.24 (125) | 0.00 (0) | 0.1695 |
| ≥25 kg/m2 | 40.76 (86) | 100.00 (2) | ||
| Adherence to the MD | Good | 44.62 (29) | 55.38 (36) | 0.01448 |
| Poor-to-moderate | 63.13 (113) | 36.87 (66) | ||
| Variables concerning the mother | ||||
| Disposable income | I make ends meet very/quite easily | 58.54 (96) | 41.46 (68) | 0.8385 |
| I make ends meet with some/great difficulty | 56.32 (49) | 43.68 (38) | ||
| Marital status | Married | 57.21 (119) | 42.79 (89) | 0.575 |
| Unmarried/separated/divorced/ widowed | 63.04 (29) | 36.96 (17) | ||
| Health literacy | Adequate | 56.02 (93) | 43.98 (73) | 0.4046 |
| Marginal/limited | 63.64 (35) | 36.36 (20) | ||