Table 2.

Comparison of prevalence of abnormal thoracic kyphosis.

Upper limits for normal thoracic kyphosis	Prevalence of abnormal thoracic kyphosis (%)
	Current study	Erkkila et al. (2)	Denton et al. (3)	Logvinoff et al. (4)
35°	2.8 (aged 8–16)	14 (aged 5–9)
		32 (aged 10–14)
40°	1.4 (aged 8–16)		5.5 (adolescents)
Mean + 2 SD	2.8 (aged 8–16)			22 (aged 6–36)