Fig 2. Kaplan–Meier curves of fracture-free survival according to pubertal timing.

The graph shows fracture-free survival in 37,971 men followed for a mean of 37.3 years after 20 years of age according to whether participants had early (lowest tertile), average (middle tertile), or late (highest tertile) age at peak height velocity. The P value for comparison between groups assessed by the log-rank test was P = 0.186 for tertile 2 versus tertile 1 and P < 0.001 for tertile 3 versus tertile 1. Limits for age at PHV: tertile 1, ≤13.6 years of age; tertile 2, >13.6 and ≤14.5 years of age; tertile 3, >14.5 years of age.