Table 2. Odds ratio and 95% confidence interval of being overweight (BMI≥25 kg/m²) as a young-adult (age 20–29 years) according to percentile of the WHO infant growth standards: Infants ≥85^th percentile vs. <85^th percentile.

Metric: WHO Weight for Age
Outcome	Target Age (Months)	aNovwt/ N85th	1OR (95% CI)	2OR (95% CI)	3OR (95% CI)
Overweight	0	20/47	2.87 (1.48–5.58)	NA	2.02 (0.99–4.13)
	1	15/27	4.91 (2.13–11.36)	4.14 (1.60–10.69)	3.50 (1.28–9.53)
	3	3/9	NA	NA	NA
	6	14/34	2.45 (1.17–5.13)	2.03 (0.94–4.37)	2.40 (1.06–5.42)
	9	29/72	2.56 (1.48–4.43)	2.22 (1.22–4.01)	2.34 (1.24–4.43)
	12	37/98	2.39 (1.45–3.94)	2.12 (1.25–3.59)	2.17 (1.24–3.81)
	18	39/100	2.72 (1.65–4.47)	2.46 (1.47–4.12)	2.67 (1.54–4.64)
	24	30/70	3.04 (1.75–5.27)	2.71 (1.53–4.80)	2.91 (1.57–5.40)
Metric: WHO Weight for length
	0	6/16	2.55 (0.87–7.44)	NA	2.13 (0.68–6.68)
	1	7/21	1.94 (0.74–5.09)	1.42 (0.45–4.45)	1.58 (0.47–5.30)
	3	4/15	1.29 (0.39–4.22)	0.92 (0.24–3.62)	0.99 (0.24–4.07)
	6	9/30	1.41 (0.62–3.22)	1.23 (0.52–2.91)	1.53 (0.62–3.78)
	9	17/51	1.79 (0.94–3.40)	1.72 (0.89–3.32)	1.92 (0.95–3.85)
	12	29/85	2.01 (1.18–3.42)	2.00 (1.16–3.45)	1.98 (1.11–3.52)
	18	38/102	2.68 (1.51–4.48)	2.70 (1.59–4.59)	2.65 (1.51–4.65)
	24	20/56	2.24 (1.19–4.23)	2.23 (1.15–4.32)	1.90 (0.93–3.87)

-Overall N = 422, 101 overweight young adults (BMI≥25 kg/m²).

- OR (95% CI) represents estimate for ≥85^th percentile by target age compared to <85^th percentile by target age (OR = 1.00).

- ^aN^ovwt/ N^85th =  Number who became overweight as young adults in the group who were ≥85^th% at the target age.

- Model 1: ¹OR (95% CI)  =  Adjusted for sex, gestational age at birth, age at adulthood obesity assessment, birth year,

- Model 2: ²OR (95% CI)  =  Model 1 further adjusted for birth WHO weight-for-age or weight-for-length Z-score.

- Model 3: ³ OR (95% CI)  =  Model 2 plus maternal and paternal age and BMI.