Table 3 Descriptive characteristics for health-related quality of life at time 1 and time 2 for girls (N = 144) and boys (N = 67)

Physical well-being, mean [95% CI]^a

45.6 [44.2–47.1]^b

49.9 [47.2–52.6]^b

43.1 [41.6–44.5]

45.9 [43.2–48.6]

Psychological well-being, mean [95% CI]^a

44.4 [43.1–45.6]^b

49.7 [47.4–52.0]^b

41.4 [40.2–42.6]^b

45.6 [43.4–47.8]^b

Autonomy and parent relations, mean [95% CI]^a

52.6 [51.3–53.9]

55.0 [52.8–57.2]

51.0 [49.9–52.1]^b

55.0 [52.1–57.8]^b

Social support and peers, mean [95% CI]^a

48.1 [46.8–49.4]

48.3 [46.4–50.2]

46.4 [44.9–47.9]

48.1 [45.9–50.3]

School environment, mean [95% CI]^a

48.3 [47.0–49.6]^b

51.6 [49.1–54.1]^b

45.2 [43.7–46.8]^b

49.1 [46.7–51.6]^b