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Table 1 Characteristics of pubertal girls at Tanner 2 and Tanner 4 in the Chilean Growth and Obesity Cohort Study

From: Association between indicators of systemic inflammation biomarkers during puberty with breast density and onset of menarche

Characteristic

Tanner 2 (n = 397)

Tanner 4 (n = 356)

N missing

DistributionA

N missing

DistributionA

Age (years)

0

9.44 (1.31)

0

11.16 (0.84)

Age at menarche

52

11.80 (0.89)

24

11.75 (0.84)

Height (Z-score)

0

0.09 (0.96)

1

0.39 (1.00)

BMI (Z-score)

0

0.81 (1.12)

1

0.91 (1.05)

Fat percentage (%)

1

26.28 (4.88)

0

26.57 (5.06)

Maternal education

0

 

0

 

 No post-secondary education

 

304 (76.57)

 

268 (75.28)

 Post-secondary education

 

93 (23.43)

 

88 (24.72)

Ethnicity

0

 

0

 

 No Mapuche background

 

327 (82.37)

 

294 (82.58)

 Mapuche background

 

70 (17.63)

 

62 (17.42)

Birth weight (kg)

12

3.38 (0.39)

10

3.34 (0.39)

Birth length (cm)

12

49.77 (1.71)

10

49.68 (1.74)

Inflammatory biomarkersB

 C-reactive protein (CRP; mg/L)

44

1.74 (2.46)

2

1.49 (2.26)

 Interleukin-6 (IL-6; pg/mL)

11

2.10 (2.70)

5

1.93 (2.29)

 TNF receptor 2 (TNFR2; pg/mL)

11

2270.96 (579.53)

5

2345.29 (548.80)

Breast composition at Tanner 4

 Total breast volume (BV; cm3)

119

206.81 (95.65)

11

221.48 (100.79)

 Fibroglandular volume (FGV; cm3)

119

81.50 (32.11)

11

82.59 (33.78)

 Percent fibroglandular volume (%FGV; cm3)

119

43.38 (16.05)

11

41.36 (16.66)

  1. AMean (SD) for continuous measures; count (%) for categorical measures
  2. BRange of inflammatory marker levels at Tanner 2: CRP 0.1–15.7 mg/L, IL-6 0.3–19.7 pg/mL, TNFR2 944.4–4902.5. Range of inflammatory markers at Tanner 4: CRP 0.1–18.9 mg/L, IL-6 0.3–24.0 pg/mL, TNFR2 1345.8–4548.1 pg/mL