Table 1 Anthropometric and general characteristics of indigenous and non-indigenous girls in the Araucanía Region, Chile

Age at menarche (months)

\( \overline{x}\pm \mathrm{S}\mathrm{D} \)

146.7 ± 11.3

151.0 ± 10.8

0.003*

Height at menarche (cm)

\( \overline{x}\pm \mathrm{S}\mathrm{D} \)

152.1 ± 5.7

149.9 ± 4.8

0.002*

Z-score for height/age at menarche

\( \overline{x}\pm \mathrm{S}\mathrm{D} \)

−0.01 ± 1.02

−0.61 ± 0.81

< 0.001*

Weight at menarche (kg)

\( \overline{x}\pm \mathrm{S}\mathrm{D} \)

49.6 ± 8.8

51.7 ± 9.2

0.073*

Z-score for BMI/age at menarche

\( \overline{x}\pm \mathrm{S}\mathrm{D} \)

0.95 ± 1.1

1.27 ± 0.98

0.017*

Mother’s schooling (years)

\( \overline{x}\pm \mathrm{S}\mathrm{D} \)

9.5 ± 2.8

6.6 ± 2.9

0.001 *

Father’s schooling (years)

\( \overline{x}\pm \mathrm{S}\mathrm{D} \)

9.6 ± 2.8

7.2 ± 2.8

0.001*

Socioeconomic level

%

Middle

46.2

8.5

Middle-low

44.4

41.5

< 0.001**

low

9.4

50.0