Centiles for adult head circumference - BMJ

ArchivesofDiseaseinChildhood1992;67:1286 -1287 CentilesforadultheadcircumferenceKMDB ushby,TCole,JNSM atthews, (ArchDisChild1992;67:1286-7)Measuremento ftheoccipitofrontalheadcir-cumfer, ' ,forexample,the97thcentilewascalculatedt obemean+ on July 22, 2023 by guest. Protected by Dis Child: first published as on 1 October 1992. Downloaded from ,therewasnoindicationthatthedifferentobs ervershaddifferentprecisions.(Inasmallsa mple,20subjectsweremeasuredtwice:theSDof theintraobservermeasurementerrorwas0-133 cm.)Astherewasnoneedtoincludeanyvariable sinthemodelforthevariance,Aitkin'sapproa chreducestoordinarymultipleregression,4w hichwasthenusedtoexaminetheeffectofage,h eight, :..:._ _~~~ ,.. ;;, ..'..50-j;i; j;iii.;i.

Arch Dis Child: first published as 10.1136/adc.67.10.1286 on 1 October 1992. Downloaded from . Created Date: 20070125123457Z ...

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Transcription of Centiles for adult head circumference - BMJ

1 ArchivesofDiseaseinChildhood1992;67:1286 -1287 CentilesforadultheadcircumferenceKMDB ushby,TCole,JNSM atthews, (ArchDisChild1992;67:1286-7)Measuremento ftheoccipitofrontalheadcir-cumfer, ' ,forexample,the97thcentilewascalculatedt obemean+ on July 22, 2023 by guest. Protected by Dis Child: first published as on 1 October 1992. Downloaded from ,therewasnoindicationthatthedifferentobs ervershaddifferentprecisions.(Inasmallsa mple,20subjectsweremeasuredtwice:theSDof theintraobservermeasurementerrorwas0-133 cm.)Astherewasnoneedtoincludeanyvariable sinthemodelforthevariance,Aitkin'sapproa chreducestoordinarymultipleregression,4w hichwasthenusedtoexaminetheeffectofage,h eight, :..:._ _~~~ ,.. ;;, ..'..50-j;i; j;iii.;i.

2 ;.150160170180190200205 Height(cm) , ,,.. '''''.-."'.'.!.. ^ )50_____14015016017010190200 Height(cm) ,ontheTannerchartsthe97thcenltileforagir lof16yearsis564cmandthe50thcentile542cm. (slope0-08673cm/cm,SE0-01031cm/cm,p<O000 1)andthatamalewouldhaveaheadcircumferenc ethatwasonaverage1-38cmlargerthanthatofa femaleofequalheight(meandifference1-378c m,SE0-211cm,p<00001).Therelationsgivenin thefiguresarereason-ableforheightsbetwee n140and190cm(females)and150to200cm(males ). , 'didnotdiscreditthehypo-thesisofnormalit y(W=0986,p=0-69,usingRoyston'sapproximat ion6).DiscussionWehaveproducedcentilecha rtsforadultheadcircumferencebasedonmeasu rementsfromtwoBritishcentres(figs3and4). Fromourmeasurementsitisapparentthatitcou ldbequitemisleadingtomakeanassessmentofa nindividual' ,wehaveshownthatinadultmalesespeciallyit isquitemisleadingtousetheendofthepaediat ricchartstoplotparentalheadcircumference , , , ,UniversityofNewcasdeuponTyne, , :OxfordMedicalDatabases, , ;96 ,ArneilGC, :ChurchillLivingstone,1984 ;36 , (completesamples).

3 Biometrika1%5;52 ,AmosCI,ParryDM, ;40 , :MincklerJ, :McGrawHill,1%68:120-37. on July 22, 2023 by guest. Protected by Dis Child: first published as on 1 October 1992. Downloaded from

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