Table 4.

Test-retest reliability between T1 and T2 (after 11 weeks) for self-reports of sun exposure

Question, age span (y)Cases (n = 52)
Controls (n = 52)
a/N*κw (95% CI)a/N*κw (95% CI)
Time in the sun in summer (five levels: <1 hour daily to >4 hours daily)
    6-1026/520.65(0.38-0.91)31/520.61(0.34-0.88)
    11-1525/520.59(0.35-0.84)30/520.57(0.30-0.84)
    16-2017/520.57(0.31-0.83)24/520.47(0.20-0.74)
    Last 331/520.71(0.44-0.98)22/510.60(0.33-0.86)
Time in the sun in winter (five levels: <1 hour daily to >4 hours daily)
    6-1026/520.60(0.33-0.87)24/520.65(0.38-0.92)
    11-1520/520.50(0.23-0.77)24/520.43(0.18-0.69)
    16-2023/520.68(0.41-0.95)22/520.56(0.29-0.82)
    Last 334/520.74(0.47-1.00)24/520.61(0.34-0.88)
Activities outside in summer (four levels: not that often to virtually all the time)
    6-1026/520.58(0.31-0.85)33/520.51(0.24-0.78)
    11-1525/520.58(0.31-0.84)33/520.63(0.36-0.90)
    16-2028/520.63(0.36-0.90)30/520.56(0.29-0.82)
    Last 330/520.59(0.32-0.86)26/520.52(0.25-0.79)
Activities outside in winter (four levels: not that often to virtually all the time)
    6-1024/520.53(0.26-0.80)28/520.61(0.34-0.88)
    11-1524/520.59(0.32-0.87)28/520.70(0.43-0.97)
    16-2031/520.69(0.41-0.96)31/520.62(0.35-0.88)
    Last 337/520.63(0.36-0.90)21/510.56(0.29-0.83)
Occupational sun exposure (three levels: mainly indoors to mainly outdoors)
    Working years44/500.86(0.58-1.00)45/520.85(0.58-1.00)
  • * Number of subjects with exact agreement on both reports/total number of subjects.

  • Weighted κ statistic (95% CI).