Table 1.

Ranges of thoracic kyphosis and lumbar lordosis (degrees) during growth from 11 to 22 years

Measure	Girls				Boys				Difference between sexes
Age	n	Mean	Range	SD	n	Mean	Range	SD	P-value
Thoracic kyphosis
11	514	26.6	5–57	8.9	545	27.8	4–58	8.5	0.03
12	476	27.5	6–61	9.6	498	28.0	5–56	9.4	0.41
13	428	29.5	2–63	9.8	473	30.9	5–61	10.4	0.04
14	393	29.0	7–57	9.0	454	30.0	6–69	9.7	0.12
22	208	26.1	8–57	8.9	222	33.7	9–61	9.6	0.001
Lumbar lordosis
11	514	38.7	17–75	8.8	545	36.9	11–64	8.4	<0.001
12	476	35.5	16–61	8.3	498	34.2	16–61	7.7	0.01
13	428	37.0	3–66	8.7	473	35.8	17–58	8.0	0.03
14	393	33.4	18–55	7.4	454	33.0	15–56	7.0	0.42
22	208	37.8	18–72	8.1	222	34.6	11–58	8.6	0.001