Objective: To describe the prevalence and determinants of gestational night blindness in pregnant women receiving care in a hospital in Rio de Janeiro, Brazil. Design: Cross-sectional study of pregnant and postpartum women receiving care in a public hospital in Rio de Janeiro from 1999 to 2001 (group I; n 225) or from 2005 to 2008 (group II; n 381). Night blindness was identified through a standardized and validated interview (WHO, 1996). The determinants of gestational night blindness were identified through a hierarchical logistic regression model. Setting: Public maternity hospital in Rio de Janeiro, RJ, Brazil. Subjects: Adult pregnant and postpartum women (n 606), aged ≥20 years. Results: The prevalence of gestational night blindness was 9·9 %. The final model revealed that not living in the South Zone of Rio de Janeiro (distal level: adjusted OR = 1·846; 95 % CI 1·002, 3·401), belonging to group I (intermediate level: adjusted OR = 2·183; 95 % CI 1·066, 4·471) and for the proximal level, having a history of abortion (adjusted OR = 2·840; 95 % CI 1·134, 7·115) and having anaemia during the first and second trimesters of pregnancy (adjusted OR = 3·776; 95 % CI 1·579, 9·029) were determinants of gestational night blindness. Conclusion: Gestational night blindness should be assessed for during the prenatal care of all pregnant women, especially those living in deprived areas of the city and/or who have a history of abortion or anaemia. Nutritional monitoring is recommended during pregnancy to control gestational night blindness.
Keywords
Night blindness Vitamin A deficiencyPregnant women Cross-sectional study Vitamin A deficiency (VAD) remains an ongoing public health problem in many areas of the world. Children and women of childbearing age are most affected, with an estimated 190 million children of pre-school age and 19 million pregnant women having VAD (1) . Based on night blindness (XN; the ocular symptom of VAD) and xerophthalmia (the first stage of ocular manifestations due to VAD), it is estimated that 5·2 million pre-school children and 9·8 million pregnant women are impacted, corresponding to 0·9 % and 7·8 % of these populations worldwide (1,2) . A national survey conducted in Brazil examined VAD among children of pre-school age and women of reproductive age (3) . Analyses of serum retinol, which is the biochemical indicator of VAD, revealed that women from the Southeast region evinced the highest prevalence of VAD in the country (14·0 %), surpassing those in the Northeast region (12·1 %), which is considered at higher risk for this