Familial Aggregation and Heritability of Myopia: A Local Population Survey in Shanxi, China

Table 1

Family aggregation of myopia in this study.

Characteristics	Without family aggregation (N, %)	With family aggregation (N, %)	χ2
Nonmyopic student	592 (91.50%)	55 (8.50)	151.235	<0.001
Myopic student	761 (65.26)	405 (34.73)

N = number of families; % = N/the total N.