Early maternal weight gain as a risk factor for SGA in pregnancies with hyperemesis gravidarum: a 15-year hospital cohort study

Table 1 Baseline data for 892 women hospitalized with hyperemesis gravidarum at Haukeland University Hospital during 2002–2016

Variable	Mean	95% CI^a	Median	95% CI
Age at admission (years)	28.1	27.8–28.5	28.0	28.0–29.0
Prepregnancy BMI^b,c (kg/m²)	24.4	24.1–24.7	23.6	23.3–23.9
Weight at admission^d (kg)	63.2	62.3–64.1	61.0	60.0–62.5
Weight loss at admission^e (kg)	4.4	4.2–4.6	4.0	4.0–4.0
Gestational age at admission^f (weeks)	9.4	9.2–9.6	8.6	8.4–9.0
	Number		Percentage
Hyperemesis previously^g
HG in previous pregnancy	263		47.9
No HG in previous pregnancy	286		52.1
Smoking^h
Smoker	44		5.2
Non smoker	795		94.8
Gravidity
Gravida 1	279		31.3
Gravida ≥ 2	613		68.7
Parity
Para 0	379		42.5
Para ≥ 1	513		57.5
BMI categories^i,j
Underweight (< 20 kg/m²)	42		4.7
Normal weight (20.0–24.9 kg/m²)	514		57.9
Overweight (25.0–29.9 kg/m²)	230		25.9
Obese (≥ 30 kg/m²)	102		11.5

^a: Confidence Interval, ^b: Body Mass Index, ^c: n = 4 missing values, ^d: n = 1 missing value, ^e: Lowest weight at admission, n = 22 missing values, ^f: Gestational Age, as assessed by ultrasound measurement [19], ^g: n = 64 missing values out of 613 women with any earlier pregnancy (Gravida ≥ 2), ^h: n = 53 missing values, ⁱ: Body Mass Index, categorized according to Institute of Medicine (IOM) 2009 guidelines [18], j: n = 4 missing values

ISSN: 1471-2393