Study name

Autumn POH

Summer POH

Spring POH

Winter POH

Our data

232 (22.5%)

348 (33.7%)

219 (21.2%)

233 (22.6%)

E. Eski., et al. [18]

8 (11.3%)

19 (26.8%)

15 (21.1%)

29 (40.8%)

Kwok, M.M., et al. 2018 [22]

21 (1.67%)

18 (1.43%)

32 (2.54%)

16 (1.27%)

Alobaid, F., et al. 2019 [20]

1 (0.9%)

2 (1.5%)

5 (3.2%)

7 (6%)

Lee, M.S.W., et al. 2005 [21]

8 (22%)

5 (13.5%)

14 (38%)

10 (27.02%)