Birth time category

Observed number

Expected number

p value

Zi, Wu, Mao, You

(only those with 1 whorl on the center line of the midline were count)

40 (Zi), 20 (Wu), 22 (Mao), 35 (You)

68 (Zi), 75 (Wu), 63 (Mao), 63 (You)

0.039120916

Chen, Shu, Chou, Wei

(only those with 2 whorls were count)

5 (Chen), 2 (Shu), 9 (Chou), 7 (Wei)

61(Chen), 31 (Shu), 42 (Chou), 52 (Wei)

0.000000026

Yin, Shen, Si, Hai

(only those with 1 whorl, either on the left or right side from the midline were count)

30 (Yin), 37 (Shen), 29 (Si), 40 (Hai)

46 (Yin), 54 (Shen), 53 (Si), 49 (Hai)

0.002665066