Table 3

Discrepancy of genders in different residence and regions

Stratification	China reference		WHO reference
Stratification	χ²	P value	χ²	P value
Residence
Urban	0.004	0.947	55.163	<0.0001
Rural	1.981	0.159	141.122	<0.0001
Socioeconomic development
Developed	0.041	0.840	56.555	<0.0001
Intermediately developed	0.319	0.572	59.406	<0.0001
Underdeveloped	1.100	0.294	80.656	<0.0001
Total	1.270	0.260	195.227	<0.0001