|     Boys |     Girls | ||
---|---|---|---|---|
 | Correlation coefficient | P value | Correlation coefficient | P value |
Internalizing problems | 0.01 | 0.551 | −0.01 | 0.785 |
Externalizing problems | 0.06 | 0.003 | 0.02 | 0.399 |
Physical activity, h/day | −0.03 | 0.101 | −0.06 | 0.001 |
Sitting time, h/day | 0.11 | <0.001 | 0.10 | <0.001 |
Sleeping, h/day | 0.00 | 0.939 | 0.02 | 0.304 |
BMI, kg/m2 | −0.01 | 0.508 | 0.01 | 0.708 |
Smoking | 0.11 | <0.001 | 0.08 | <0.001 |
BMI = body mass index |  |  |  |  |