Table 4: Myopia had a significantly greater prevalence in Class II patients [35].

Type of
visual defect
Class I (n=119) Class II (n=62) Class II Division 2 (n=15) Class III (n=20) Results of χ2 test
n - % n - % n - % n- % P value
Myopic 21 - 9.7% 42 - 19.4% 6 - 2.7% 3 - 1.3% p<0.0001
Non-myopic 98 - 45.3% 20 - 9.25% 9 - 4.1% 17 - 7.8% p<0.005

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