Variation in methods of predicting adult height for children with idiopathic short stature.
OBJECTIVE
Recombinant human growth hormone (GH) is approved for treatment of children with idiopathic short stature, and endocrinologists often depend on algorithms to predict adult height. Because algorithm performance often is included in treatment decisions, we sought to evaluate agreement among height prediction formulas.


METHODS
We identified 3 commonly used algorithms for height prediction, the Bayley-Pinneau, Roche-Wainer-Thissen, and Khamis-Roche methods. We constructed simulated samples of children with typical distributions of ages, heights, weights, bone ages, and parental heights seen in patients with idiopathic short stature, and we applied the algorithms to the simulated sample to determine whether predicted adult height was <160 cm for boys or <150 cm for girls (<1.2nd height percentiles for adults).


RESULTS
We found substantial disagreement among algorithms in the proportions of simulated cases with predicted adult heights of <1.2nd percentile, a cutoff value that may influence GH treatment decisions. With the Bayley-Pinneau formula, 43% of boys and 81% of girls had predicted adult heights below this threshold; with the Khamis-Roche method, only 3% of boys and 0.2% of girls had predicted heights of <1.2nd percentile. Roche-Wainer-Thissen predictions were between those values. Overall agreement of the methods was poor (κ = 0.21) for boys and negative for girls.


CONCLUSIONS
Wide variation exists among formulas used to predict adult heights. Because these algorithms may be used in decisions regarding whether to initiate GH treatment and assessment of the efficacy of GH in research trials, it is important for parents, pediatricians, and investigators to recognize the considerable variation involved in height predictions.
Topor
Lisa Swartz
LS
Children's Hospital Boston, Division of Endocrinology, 300 Longwood Ave, Boston, MA 02115, USA. lisa.topor@childrens.harvard.edu
Feldman
Henry A
HA
Bauchner
Howard
H
Cohen
Laurie E
LE
D000293:Adolescent; D000328:Adult; D000365:Age Determination by Skeleton; D000465:Algorithms; D001827:Body Height / Q000187:drug effects; D001835:Body Weight / Q000187:drug effects; D002648:Child; D004392:Dwarfism / Q000175:diagnosis* / Q000188:drug therapy / Q000209:etiology; D005260:Female; D019382:Human Growth Hormone / Q000627:therapeutic use; D006801:Humans; D008297:Male; D011994:Recombinant Proteins / Q000627:therapeutic use; D012016:Reference Values; D015203:Reproducibility of Results; D012737:Sex Factors
D011994:Recombinant Proteins; D019382:Human Growth Hormone