Fig. 4From: HIV and development of epithelial cell abnormalities in women with prior normal cervical cytology in NigeriaKaplan-Meier Plot of parity at first cervical cancer screening with normal cytology and development of ECAs at subsequent follow up Pap cytology (log-rank test, p-value = 0.001). Proportional hazards assumption test (global test: X2 = 4.25, df = 1, p = 0.039)Back to article page