Analysis of linear growth during puberty.

Area of Science:

• Pediatric endocrinology
• Human growth and development
• Biostatistics in growth analysis

Background:

• Understanding linear growth patterns is crucial for assessing child development and identifying growth abnormalities.
• The pubertal growth spurt (PGS) is a key phase influencing final adult height.
• Previous studies have explored factors affecting growth, but the precise impact of timing of peak height velocity (PHV) requires further elucidation.

Purpose of the Study:

• To analyze linear growth patterns in a cohort of children and adolescents.
• To determine the relationship between the age at peak height velocity (PHV) and final adult height.
• To investigate the influence of PHV timing on pubertal growth parameters and final stature.

Main Methods:

• Longitudinal growth data from 438 boys and 483 girls (ages 6-17) were analyzed.
• Cubic spline functions were used to model annual growth records.
• Key growth parameters, including peak height velocity (PHV) and age at PHV, were derived from fitted growth curves.

Main Results:

• Mean age at PHV was 11.2 years for girls and 13.0 years for boys, with mean PHV of 8.7 cm/year and 10.3 cm/year, respectively.
• Age at PHV showed significant correlations with PHV, total pubertal gain, and height at various growth stages.
• While groups based on PHV timing showed no difference in final height initially, adjusting for height at age 6 revealed a significant positive correlation between age at PHV and final height.

Conclusions:

• The age at which peak height velocity occurs is a significant determinant of final adult height.
• Early maturation, indicated by earlier PHV, is associated with greater final height when accounting for initial growth differences.
• These findings underscore the importance of considering the timing of pubertal development in understanding individual growth trajectories.