Table 1 Descriptive statistics.
From: Salivary DNA methylation and pubertal development in adolescents
Texas Twin Project (TTP) | ||||
|---|---|---|---|---|
Pubertal age analytic sample | Pubertal pace analytic sample | |||
Girls | Boys | Girls | Boys | |
N | 594 | 591 | 62 | 61 |
Chronological age (M, SD) | 13.9 y (2.89 y) Range: 8-19.50 y | 13.8 y (2.91 y) Range: 7.9–19.50 y | WI: 11.58 y (0.93 y) Range: 10-12.90 y | WI: 11.50 y (0.93 y) Range: 10–13.00 y |
WII: 14.24 y (1.28 y) Range: 11.90–16.40 y | WII: 13.81 y (1.28 y) Range: 11.20–17.10 y | |||
Pubertal age (M, SD) | 14.0 y (3.42 y) | 13.4 y (3.84 y) | WI: 11.14 y (2.11 y) | WI: 10.24 y (2.93 y) |
WII: 14.97 y (2.82 y) | WII: 14.00 y (2.92 y) | |||
Pubertal pace (M, SD) | NA | NA | 1.48 (1.00) | 1.61 (1.44) |
Postmenarcheal (%) | 64.8 | NA | WI: 22.6 | NA |
WII: 80.6 | NA | |||
Age at menarche (M, SD) | 12.1 y (1.16 y) | NA | 11.89 y (1.08 y) | NA |
Height (M, SD) | 61.1 in (5.04 in) | 63.9 in (6.59 in) | WI: 58.00 in (4.20 in) | WI: 59.03 in (3.52 in) |
WII: 62.43 in (3.01 in) | WII: 64.78 in (4.21 in) | |||
BMI (M, SD) | 20.81 (5.19) | 20.3 (4.54) | WI: 18.50 (3.59) | WI: 18.05 (3.98) |
WII: 21.02 (4.01) | WII: 20.17 (4.93) | |||
Race/ethnicity (%) | ||||
White | 60.6 | 61.1 | 61.3 | 72.1 |
Black | 9.4 | 8.8 | 0 | 8.2 |
Latinx | 11.8 | 11 | 9.7 | 1.6 |
Latinx-White | 9.4 | 8.1 | 22.6 | 11.5 |
Asian | 7.7 | 8.8 | 6.5 | 6.6 |
Multiracial | 1 | 2.2 | 0 | 0 |
Future of Families and Child Wellbeing Study (FFCW) | ||||
|---|---|---|---|---|
Age 9 sample (early puberty) | Age 15 sample | |||
Girls | Boys | Girls | Boys | |
N | 972 | 984 | 974 | 981 |
Chronological age (M, SD) | 9.44 y (0.41 y) Range: 8.76–12.25 y | 9.40 y (0.39 y) Range: 8.84–12.01 y | 15.55 y (0.65 y) Range: 14.43–18.35 y | 15.55 y (0.65 y) Range: 14.43–18.52 y |
Postmenarcheal (%) | 4.1 | NA | 96 | NA |
Age at menarche (M, SD) | 9.25 y (0.71 y) | NA | 12.29 y (1.52 y) | NA |
Height (M, SD) | 54.08 in (2.93 in) | 53.68 in (2.72 in) | 63.55 in (2.76 in) | 67.83 in (3.35 in) |
BMI (M, SD) | 19.95 (4.75) | 19.18 (4.30) | 24.99 (6.35) | 23.96 (5.96) |
Race/ethnicity (%) | ||||
White | 18.1 | 17.8 | 18.2 | 17.5 |
Black | 45.2 | 41.8 | 45.8 | 42.2 |
Latinx | 24.9 | 26.1 | 24.3 | 26.0 |
Asian | 2.0 | 3.4 | 2.0 | 3.4 |
Multiracial | 5.3 | 4.6 | 5.3 | 4.5 |
Twin Life | ||||
|---|---|---|---|---|
Adolescent sample (ages 14–16) | Adolescent to young adult sample (ages 15–29) | |||
Girls | Boys | Girls | ||
N | 209 | 186 | 307 | |
Chronological age (M, SD) | 15.46 y (0.32 y) Range: 14.83–16.25 y | 15.48 y (0.30 y) Range: 14.83–16.08 y | 19.72 y (5.01 y) Range: 14.83–29.17 y | |
Postmenarcheal (%) | 95 | NA | 100 | |
Age at menarche (M, SD) | 12.82 y (1.23 y) | NA | 12.84 y (1.22 y) | |
Height (M, SD) | 65.70 in (4.17 in) | 70.93 in (2.53 in) | 65.81 in (2.66 in) | |
BMI (M, SD) | 21.03 (3.29) | 22.32 (4.49) | 22.58 (4.69) | |
Race/ethnicity (%) | ||||
White | 100 | 100 | 100 | |
Black | 0 | 0 | 0 | |
Latinx | 0 | 0 | 0 | |
Latinx-White | 0 | 0 | 0 | |
Asian | 0 | 0 | 0 | |
Multiracial | 0 | 0 | 0 | |
