Table 1 Categories of birth weight, birth length and body mass index at 4 years of age
Minimum–maximumCategoriesCut-off valuesnn (%)
Birth weight (537–5300 g)⩽10th percentile⩽2860 g2869288 (10.0)
10th–90th percentile>2860 to <4200 g2289 (79.8)
⩾90th percentile⩾4200 g292 (10.2)
Birth length (29–58 cm)⩽10th percentile⩽47 cm2839325 (11.4)
10th–90th percentile>47 to <53 cm2100 (74.0)
⩾90th percentile⩾53 cm414 (14.6)
Body mass index at age 4 (12.8–23.9 kg/m2)⩽10th percentile⩽14.7 kg/m22846279 (9.8)
10th–90th percentile>14.7 to <18.0 kg/m22294 (80.6)
⩾90th percentile⩾18.0 kg/m2273 (9.6)
  • Body mass index was calculated as body weight in kilograms divided by the square of the height in metres (kg/m2). Some values for birth length (n = 30) and body mass index at age 4 (n = 23) are missing.