Table 1.

Frequencies and percentages of T1 subject characteristics. The Tromsø Study – Fit Futures

	All (N = 676)
Sex
Boys	306 (45.3%)
Chronic disease T1
No	474 (70.1%)
Yes, one or more	202 (29.9%)
Chronic pain T1
No	512 (75.7%)
Yes	164 (24.3%)
SES mother T1
Low	391.1 (57.8%)
High	284.9 (42.2%)
SES father T1
Low	433.7 (64.2%)
High	242.3 (35.8%)
Feeling of enough sleep T1
No	389 (57.5%)
Yes	287 (42.5%)
Sleep onset latency (30 min) T1
No	429 (63.4%)
Yes	247 (36.6%)
Using the ActiGraph in the winter
T1	552 (81.6%)
T2	555 (82.1%)
Considering dropping out of school T1
No	575 (85%)
Yes	101 (15%)
Smoking T1
No	545 (80.6%)
Yes	131 (19.4%)