When analysing obstetric factors in relation to BMI, the relationship between BMI and the number of births, twin pregnancies, prematurity, hypertensive pregnancy disorders, gestational diabetes (both controlled with insulin and through diet), the risk of preterm birth, deep vein thrombosis, oligohydramnios, and polyhydramnios was analysed (Table 2). Here, INS is linked to deep vein thrombosis.