1. The proportion of age groups in each cup-to-disc ratio (CDR) class.
The proportion of age groups in each cup-to-disc ratio (CDR) class. From the results of residual analysis, white arrowheads pointing up (△) indicate that observation value is significantly more than the expectation value, while black arrowheads pointing down (▼) indicate that observation value is significantly less than expectation value.
Hideki Fukuoka et al. BMJ Open Ophth 2017;1:e000012
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