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V V V V V V V Table W1. L, M and S coefficients to convert birthweight to a z-score, based on the data of Tin. ADDIN EN.CITE Tin199718961896189617Tin, W.Wariyar, U. K.Hey, E. N.Selection biases invalidate current low birthweight weight-for-gestation standardsBritish Journal of Obstetrics and GynaecologyBritish Journal of Obstetrics and GynaecologyBr J Obstet Gynaecol180-18510421997WOS:A1997WG80400012<Go to ISI>://WOS:A1997WG8040001212
Weeks gestationPower L*Median M for boys*Median M for girlsCoefficient of variation S*2215215010.2392315995760.2322416886610.2272517857540.2222618948590.21827110149750.214281114911040.210291130012490.206301146614090.202311165715920.199321187318000.195331210820260.190341235022570.182351258724860.173361282227120.162371305229320.151381326031320.141391342032860.135401355334140.131411366435210.128421373335860.125* L set to 1 as data were close to normally distributed. M curve fitted to means of sex-combined data as cubic smoothing spline with 7 edf, using log link and weighted by sample size. M for boys assumed to be 2% greater, and for girls 2% less, than the fitted curve. S curve fitted to the ratios SD/mean as cubic smoothing spline with 4 edf, using log link and weighted by sample size. Z-score calculated as .
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