1. Postnatal growth standards for preterm infants: the Preterm Postnatal Follow-up Study of the INTERGROWTH-21st Project 
Prof José Villar, MD, Francesca Giuliani, MD, Prof Zulfiqar A Bhutta, PhD, Prof Enrico Bertino, MD, Eric O Ohuma, MSc, Leila Cheikh Ismail, PhD, Prof Fernando C Barros, MD, Prof Douglas G Altman, DSc, Prof Cesar Victora, MD, Prof Julia A Noble, DPhil, Michael G Gravett, MD, Manorama Purwar, MD, Prof Ruyan Pang, MD, Ann Lambert, PhD, Aris T Papageorghiou, MD, Roseline Ochieng, MMed, Yasmin A Jaffer, MD, Prof Stephen H Kennedy, MD 
The Lancet Global Health 
Volume 3, Issue 11, Pages e681-e691 (November 2015)
DOI: /S X(15)
Copyright © 2015 Villar et al. Open Access article distributed under the terms of CC BY-NC-ND Terms and Conditions

2. Figure 1
50th centiles for postnatal weight, length, and head circumference over time in preterm babies, by gestational age at birth
The Lancet Global Health 2015 3, e681-e691DOI: ( /S X(15) )
Copyright © 2015 Villar et al. Open Access article distributed under the terms of CC BY-NC-ND Terms and Conditions

3. Figure 2
Third, 50th, and 97th centiles for postnatal weight, length, and head circumference over time in preterm babies
Data were calculated with fractional polynomial powers in a multilevel framework to account for repeated measures. Adjustment for gestational age at birth (27–32 weeks' gestation vs 33–36 weeks' gestation) and interaction between sex and age did not modify the overall fit. Dashed lines represent periods with a small sample size for boys and extrapolated values for girls. Individual observations are shown with open circles.
The Lancet Global Health 2015 3, e681-e691DOI: ( /S X(15) )
Copyright © 2015 Villar et al. Open Access article distributed under the terms of CC BY-NC-ND Terms and Conditions

4. Figure 3
Third, 50th, and 97th centiles for postnatal weight, length, and head circumference over time in preterm babies compared with INTERGROWTH-21st Newborn Size Standards18
The Lancet Global Health 2015 3, e681-e691DOI: ( /S X(15) )
Copyright © 2015 Villar et al. Open Access article distributed under the terms of CC BY-NC-ND Terms and Conditions

5. Figure 4
Third, 50th, and 97th centiles for postnatal weight, length, and head circumference over time in preterm babies compared with the WHO Child Growth Standards13
The Lancet Global Health 2015 3, e681-e691DOI: ( /S X(15) )
Copyright © 2015 Villar et al. Open Access article distributed under the terms of CC BY-NC-ND Terms and Conditions

6. Figure 5
Third, tenth, 50th, 90th, and 97th centiles for weight, length, and head circumference over time in preterm babies
Data were calculated with fractional polynomial powers in a multilevel framework to account for repeated measures. Adjustment for gestational age at birth (27–32 weeks' gestation vs 33–36 weeks' gestation) and interaction between sex and age did not modify the overall fit. Dashed lines represent periods with a small sample size for boys and extrapolated values for girls.
The Lancet Global Health 2015 3, e681-e691DOI: ( /S X(15) )
Copyright © 2015 Villar et al. Open Access article distributed under the terms of CC BY-NC-ND Terms and Conditions