Auxological data, pubertal development and final height were analyzed in 25 patients with growth hormone (GH) deficiency who were treated only with pituitary GH in 3 doses/week. 15 patients had a spontaneous onset of puberty and in 10 puberty was induced. The duration of therapy was 7.5 years, the dosage was about 11 U/m2/week and was not changed during puberty. 80% of the patients with induced puberty, but only 33% of the children with spontaneous puberty reached final heights within the 2 SD range. Final height was correlated with height at the start of treatment only in patients with spontaneous puberty, which shows the necessity of early treatment initiation in this group. The lack of this correlation in patients with induced puberty might be attributed to gonadotropin deficiency. Height at the onset of puberty was related to final height only in the group with gonadotropin deficiency. A prediction model for calculation of the first year height velocity which was derived from present treatment procedures showed a too favorable prediction for our patients. The reasons for the insufficient final results may be due to impure GH preparations, suboptimal dosage, low frequency of injections and late onset of therapy.