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Table 5 Comparison of mean weight gain velocity between the PreM Growth Study cohorts and fetal-infant estimate

From: Validating the weight gain of preterm infants between the reference growth curve of the fetus and the term infant

Cohort mean SD n Fetal infant estimate Difference Pvalue
Birth to 2 weeks postnatal age    
23-25 weeks 3.8 6.6 193 18.2 −14.4 <0.0001
26-28 weeks 2.5 5.0 429 18.0 −15.5 <0.0001
29-31 weeks 6.8 4.8 160 17.3 −10.5 <0.0001
Gain 2 weeks after birth to 37 weeks    
23-25 weeks 13.3 1.7 168 16.1 −2.8 <0.0001
26-28 weeks 14.3 2.2 381 15.4 −1.1 <0.0001
29-31 weeks 14.9 2.8 144 13.5 1.4 0.46
Gain 37 to 40* weeks (40 weeks based on the FIGR-2013)    
23-25 weeks 11.5 3.4 140 7.5 4.0 <0.0001
26-28 weeks 11.4 3.1 314 7.5 3.9 <0.0001
29-31 weeks 12.3 3.8 124 7.5 4.8 <0.0001
40 to 50 weeks (40 weeks based on the FIGR-2013)
23-25 weeks 6.9 1.7 101 6.5 0.4 0.016
26-28 weeks 7.0 1.6 256 6.5 0.5 <0.0001
29-31 weeks 6.7 1.3 100 6.5 0.2 0.09
40 to 50 weeks (40 weeks based on the WHO Growth Standard)
23-25 weeks 6.9 1.5 101 7.4 −0.5 <0.0001
26-28 weeks 7.0 1.4 256 7.4 −0.4 <0.0001
29-31 weeks 6.7 1.2 100 7.4 −0.7 <0.0001