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Table 1 Characteristics of participants

From: The effect of family and friend support on physical activity through adolescence: a longitudinal study

 

Age 13 yr

Age 15 yr

Age 17 yr

 

Boys (n = 149)

Girls (n = 157)

Boys (n = 177)

Girls (n = 179)

Boys (n = 158)

Girls (n = 159)

Chronological Age (yr)

13.0 (0.2)

13.1 (0.3)

15.0 (0.3)

15.1 (0.3)

17.2 (0.5)

17.2 (0.5)

Maturity Offseta (yr)

−0.7 (0.8)**

1.3 (0.7)

1.4 (0.8)**

3.3 (0.7)

3.5 (0.9)**

5.4 (0.8)

Height (cm)b

162.6 (9.3)

160.9 (6.8)

175.4 (8.1)**

164.5 (6.3)

178.7 (8.0)**

165.7 (6.8)

Weight (kg)b

57.9 (15.4)

56.3 (14.4)

70.8 (16.2)**

61.8 (14.4)

79.5 (19.3)**

66.9 (16.4)

Family Support (1–5)

3.1 (0.9)*

2.9 (0.9)

2.8 (0.9)*

2.6 (0.9)

2.2 (0.9)

2.1 (0.9)

Family Encourage

3.5 (1.2)*

3.2 (1.2)

3.4 (1.2)**

3.1 (1.3)

2.7 (1.3)

2.5 (1.3)

Family Do

2.8 (1.2)**

2.4 (1.2)

2.4 (1.2)**

2.0 (1.1)

1.9 (1.2)

1.8 (1.1)

Family Transport

3.2 (1.4)

3.3 (1.4)

3.1 (1.4)

3.0 (1.4)

1.9 (1.5)

1.8 (1.3)

Family Watch

2.8 (1.2)

2.6 (1.2)

2.3 (1.1)

2.3 (1.2)

1.9 (1.1)

1.9 (1.0)

Family Told

3.4 (1.3)**

3.0 (1.1)

3.0 (1.3)

2.8 (1.3)

2.4 (1.4)

2.3 (1.3)

Friend Support (1–5)

3.2 (0.9)

3.0 (1.0)

2.9 (1.1)

2.8 (1.1)

2.8 (1.1)

2.5 (1.1)

Friend Encourage

2.9 (1.3)

2.7 (1.2)

2.8 (1.3)**

2.5 (1.2)

2.7 (1.2)*

2.4 (1.2)

Friend Do

3.7 (1.1)

3.6 (1.2)

3.4 (1.3)

3.3 (1.3)

3.2 (1.3)

2.9 (1.4)

Friend Told

2.8 (1.2)

2.8 (1.3)

2.6 (1.3)

2.7 (1.3)

2.4 (1.3)

2.3 (1.3)

Time accelerometer worn (min/day)

779.5 (54.1)

787.1 (60.2)

804.6 (59.3)

799.5 (63.0)

800.4 (62.2)

812.5 (69.9)

MVPAc (min/day)

52.0 (21.7)**

35.1 (20.5)

39.1 (20.3)**

26.2 (17.2)

37.7 (21.7)**

23.8 (15.0)

MVPA- PM Weekdaycd (min/day)

30.3 (19.4)**

22.0 (15.8)

24.1 (18.9)**

15.6 (14.9)

20.6 (17.1)**

15.0 (14.1)

Transformed MVPAc

7.4 (1.4)**

6.1 (1.7)

6.5 (1.6)**

5.3 (1.7)

6.3 (1.7)**

5.1 (1.5)

Transformed MVPA- PM Weekdaycd

5.1 (1.5)**

4.3 (1.6)

4.5 (1.6)**

3.5 (1.8)

4.1 (1.8)**

3.5 (1.7)

 

N (%)

N (%)

N (%)

N (%)

N (%)

N (%)

Mother’s Ed (hs vs college)e

136 (91.3)

143 (91.1)

161 (91.0)

159 (88.8)

143 (90.5)

145 (91.2)

  1. Note. Values are presented as mean (SD)
  2. Note. MVPA moderate and vigorous-intensity physical activity
  3. aMaturity Offset calculated in years from age at peak height velocity
  4. bReported for all non-missing data, only participants with clinical exam DXA scans were measured (13-20 % missing depending on assessment and sex)
  5. cUntransformed and Box-Cox transformed minutes of MVPA reported; transformed values used in all inferential analyses
  6. dMVPA- PM Weekday = number of minutes of MVPA occurring after 3 pm on weekdays only
  7. eMother’s Ed dichotomized as High School (some or complete) vs. College (some college, 2-year degree, bachelor degree, graduate/professional degree)
  8. *p < 0.05, **p < 0.01 Student’s t-test (or chi-square test for Mother’s Ed and Dichotomized Enjoyment) of boys vs. girls
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International Journal of Behavioral Nutrition and Physical Activity

ISSN: 1479-5868

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