Table 1.
Sex ratio with shell size of oyster, Crassostrea gigas

Shell height (mm)	Number			Sex ratio (F:M, %)	Chi-square	P value
	Total	Female	Male
≤30.0	5	1	4	1:4.0 (20.0:80.0)	1.80	0.18
30.1~40.0	14	2	12	1:6.0 (14.3:85.7)	7.14	0.008
40.1~50.0	39	7	32	1:4.8 (17.9:82.1)	16.03	<0.001
50.1~60.0	60	16	44	1:2.8 (26.7:73.3)	13.07	<0.001
60.1~70.0	74	26	48	1:1.8 (35.1:64.9)	6.54	0.011
70.1~80.0	84	45	39	1:0.9 (53.6:46.4)	0.43	0.513
80.1~90.0	57	32	25	1:0.8 (56.1:43.9)	0.86	0.354
90.1~100.0	50	26	24	1:0.9 (52.0:48.0)	0.08	0.777
100.1~110.0	29	11	18	1:1.6 (37.9:62.1)	1.69	0.194
110.1~120.0	27	10	17	1:1.7 (37.0:63.0)	1.82	0.178
120.1~130.0	11	5	6	1:1.2 (45.5:54.5)	0.09	0.763
130.1≤	9	4	5	1:1.3 (44.4:55.6)	0.11	0.739
Total	459	185	274	1:1.5 (40.3:59.7)	17.257	<0.001