Table 1

 Results of cosinor analysis on original data

GroupSample sizeAmplitude (%)Acrophasep Value
0–4 Male51915.17 January0.137
0–4 Female4476.38 November0.482
5–9 Male79820.917 December0.063
5–9 Female77921.21 January0.003
10–14 Male109025.712 December0.001
10–14 Female166319.59 January0.117