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Extended INTERGROWTH-21st Newborn Size Standards (including very preterm) growth curve data

Source: R/data.R
ig_nbs_ext.Rd

A set of nested lists containing tables with reference values at different z-scores/centiles for valid gestational ages in days. The list is ordered by acronym first, then by sex and finally by z-score/centile.

Source

INTERGROWTH-21st Newborn Size in Very Preterm Infants
INTERGROWTH-21st Newborn Size Standards
INTERGROWTH-21st Newborn Size Standards - Body Composition

Note

The tables in this package are combined versions of the tables published by Villar et al. (2014) and Villar et al. (2016), so they cover 168 to 300 days' gestational age. They have been extrapolated by Simon Parker (with guidance from Eric Ohuma) to include a wider range of gestational ages, and should be applied carefully by researchers. More detail on the extrapolation process is available in an article on the package website.

References

Villar J, Cheikh Ismail L, Victora CG, Ohuma EO, Bertino E, Altman DG, et al. International standards for newborn weight, length, and head circumference by gestational age and sex: the Newborn Cross-Sectional Study of the INTERGROWTH-21st Project. Lancet 2014, 384(9946):857-68. doi:10.1016/S0140-6736(14)60932-6

Villar J, Giuliani F, Fenton TR, Ohuma EO, Ismail LC, Kennedy SH et al. INTERGROWTH-21st very preterm size at birth reference charts. Lancet 2016, 387(10021):844-45. doi:10.1016/S0140-6736(16)00384-6

Villar J, Puglia FA, Fenton TR, Ismal LC, Staines-Urias E, Giuliani F, et al. Body composition at birth and its relationship with neonatal anthropometric ratios: the newborn body composition study of the INTERGROWTH-21st project. Pediatric Research 2017, 82:305-316. doi:10.1038/pr.2017.52

Examples

names(gigs::ig_nbs_ext)
#> [1] "wfga"  "lfga"  "hcfga"
head(gigs::ig_nbs_ext$wfga$male$zscores)
#>   gest_days SD3neg SD2neg SD1neg  SD0  SD1  SD2  SD3
#> 1       154   0.27   0.33   0.40 0.48 0.59 0.71 0.86
#> 2       155   0.28   0.34   0.41 0.49 0.60 0.73 0.88
#> 3       156   0.28   0.34   0.41 0.50 0.61 0.74 0.90
#> 4       157   0.29   0.35   0.42 0.51 0.62 0.76 0.92
#> 5       158   0.29   0.36   0.43 0.52 0.64 0.77 0.94
#> 6       159   0.30   0.36   0.44 0.53 0.65 0.79 0.95