Table 2.
Behavioural characteristics in cases and controls as a whole sample or stratified by gender
| |
All children |
Boys |
Girls |
||||||
|---|---|---|---|---|---|---|---|---|---|
| Controls N= 130 | Cases N= 449 | P | Controls N= 83 | Cases N= 292 | p | Controls N=47 | Cases N= 157 | p | |
| Sports participation n (%) |
43 (33.1) |
213(47.4) |
0.004 |
29 (34.9) |
153(52.4) |
0.005 |
14 (29.8) |
60(38.2) |
0.305 |
| TV ≥ 2 hrs/day n (%) |
48(36.9) |
256(57.0) |
<0.001 |
35(42.2) |
177(60.6) |
0.003 |
13(27.7) |
79(50.3) |
0.006 |
| Calcium intake mg/day | 1137±431 | 1141±404 | 0.925 | 1175±436 | 1120±402 | 0.282 | 1069±419 | 1178±407 | 0.113 |
Data are expressed as number (%) or mean±SD, as appropriate.
The chi-squared test was used to compare proportions (sport participation, TV viewing ≥2 hours/day), while the independent sample t-test was used to compare means of daily calcium intake between case/control group.