Table 1.
Characteristics of subjects
| |
Fourth graders (age 9-10 years) |
Seventh graders (age 12-13 years) |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Boys |
Girls |
P - value* |
Boys |
Girls |
P - value* | |||||
| (n = 1,645) | (n = 1,523) | (n = 1,380) | (n = 1,321) | |||||||
| Age (years) |
9.0 |
(9.4) |
9.0 |
(9.4) |
0.751 |
12.0 |
(12.3) |
12.0 |
(12.3) |
0.277 |
| Height (cm) |
134.9 |
|
134.7 |
|
0.787 |
155.1 |
|
153.0 |
|
< 0.001 |
| Weight (kg) |
30.2 |
|
29.5 |
|
< 0.001 |
43.8 |
|
43.3 |
|
0.065 |
| BMI (kg/m2) |
16.6 |
|
16.3 |
|
< 0.001 |
18.1 |
|
18.3 |
|
0.036 |
| LDL-C (mg/dL) |
90.0 |
(92.9) |
95.0 |
(97.3) |
< 0.001 |
86.0 |
(88.9) |
93.0 |
(95.0) |
< 0.001 |
| < 110 (%) |
81.2 |
|
75.1 |
|
0.002 |
84.5 |
|
79.3 |
|
< 0.001 |
| 110 - 139 (%) |
15.2 |
|
21.6 |
|
|
12.8 |
|
17.3 |
|
|
| 140 + (%) |
3.6 |
|
3.3 |
|
|
2.8 |
|
3.3 |
|
|
| Family history of hypercholesterolemia (%) |
|
|
|
|
|
|
|
|
|
|
| No |
94.0 |
|
94.8 |
|
0.193 |
94.2 |
|
94.3 |
|
0.480 |
| Yes |
6.0 |
|
5.2 |
|
|
5.8 |
|
5.7 |
|
|
| Exercise (%) |
|
|
|
|
|
|
|
|
|
|
| Daily |
63.1 |
|
42.0 |
|
< 0.001 |
84.1 |
|
59.3 |
|
< 0.001 |
| Sometimes |
23.4 |
|
31.7 |
|
|
7.4 |
|
13.1 |
|
|
| None | 13.5 | 26.2 | 8.6 | 27.7 | ||||||
Data are expressed as a median (mean) or percentage (%).
*Mann-Whitney U-test or the chi-square test.
BMI, body mass index; LDL-C, low-density lipoprotein cholesterol.