These researchers retrospectively analysed maternity data for 26,254 singleton pregnancies recorded during the period 2006 to 2009 at National Women’s Health, Auckland, New Zealand. The study hypothesis was that after adjusting for confounders, including ethnic- specific body mass index (BMI), ethnicity would not be an independent risk factor for pre-eclampsia. Multivariable logistic regression analysis adjusted for ethnicity, BMI, maternal age, parity, smoking, social deprivation, diabetes, chronic hypertension and relevant pre-existing medical conditions. Findings revealed an independent reduced risk of pre-eclampsia in Chinese (adjusted odds ratio [aOR] 0.56) and an increased risk of pre-eclampsia in Māori (aOR 1.51) compared with European women. Other independent risk factors for pre-eclampsia included overweight and obesity, nulliparity, type 1 diabetes, chronic hypertension and pre-existing medical conditions.