Characteristics of hyperemesis gravidarum cases at hospitalization and of controls when recruited at 28 weeks.

Data presented as mean ± standard deviation, median [interquartile range] and number (%). Bivariate analyses are with Student t test for continuous data set, Mann Whitney U test for ordinal or non-parametric data, Fisher Exact test for 2×2 categorical dataset and Chi Square test for larger categorical dataset. All tests are 2-sided.
*Month income of less than RM3000 (approximately US$950)