Table 1. Physical leisure activities, use of schoolbag and SDQ scores among the study population .

Variables	No. (%)	Mean (SD)	Range
Physical leisure activities
Plying sport (h/wk)	1294 (80.3)	4.8 (6.1)	0.3–48
Using a computer (h/wk)	1059 (65.7)	7.1 (8.5)	0.3–49
Playing games (h/wk)	887 (55.0)	6.2 (8.1)	0.15–63
Watching TV (h/wk)	1381 (85.7)	12.9 (12.4)	0.2–50
Having Job (h/wk)	48 (3.0)	2.4 (2.8)	2–20
Schoolbag carriage variables
Schoolbag weight (kg)	–	3.1 (1.6)	0.26–11.5
Schoolbag as % body weight	–	6.5 (3.6)	1.44–24.13
Time spent carrying schoolbag (min)	–	49.8 (40.2)	5–120
Type of schoolbag
Backpack	1244 (77.2)	–	–
Brief case/satchel	367 (22.8)	–	–
Method of schoolbag carriage
On both shoulders	674 (41.8)	–	–
On one shoulder	762 (47.3)	–	–
By hands	175 (10.9)	–	–
Method of travel to/from school
Walk	406 (25.2)	–	–
Bus/car	1159 (71.9)	–	–
Bike	46 (2.9)	–	–
SDQ scale
Total difficulties
Normal	868 (53.8)	–	–
Borderline	309 (19.2)	–	–
Abnormal	436 (27.0)	–	–
Emotional symptoms
Normal	914 (56.7)	–	–
Borderline	231 (14.3)	–	–
Abnormal	468 (29.0)	–	–
Conduct problems
Normal	914 (56.7)	–	–
Borderline	283 (17.5)	–	–
Abnormal	416 (25.8)	–	–
Hyperactivity
Normal	1210 (75.0)	–	–
Borderline	210 (13.0)	–	–
Abnormal	193 (12.0)	–	–
Peer problems
Normal	538 (33.3)	–	–
Borderline	366 (22.7)	–	–
Abnormal	709 (44.0)	–	–
Prosocial behaviour
Normal	1212 (75.1)	–	–
Borderline	185 (11.5)	–	–
Abnormal	216 (13.4)	–	–