Table 3. Serum total cholesterol (TC) in 10- to 11-year-old children, Iwata city, Japan.
| Survey year | Test for trends | |||||||||
|
|
|
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| 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | Regression coefficient (95% CI)* | |
| Boys | ||||||||||
| Mean TC (mmol/L) | 4.34 | 4.51 | 4.36 | 4.45 | 4.49 | 4.39 | 4.48 | 4.59 | 4.50 | 0.02 (0.01, 0.02) |
| Standard deviation | 0.66 | 0.64 | 0.64 | 0.71 | 0.67 | 0.64 | 0.66 | 0.72 | 0.69 | |
| Number (%) of hyperlipidemia | ||||||||||
| Total | 513 | 568 | 527 | 552 | 506 | 527 | 468 | 490 | 522 | |
| TC ≥ 5.17 mmol/L | 56(10.9) | 88(15.5) | 54(10.2) | 84(15.2) | 78(15.4) | 63(12.0) | 69(14.7) | 94(19.2) | 84(16.1) | |
| TC ≥ 5.69 mmol/L | 14(2.7) | 28(4.9) | 18(3.4) | 24(4.3) | 27(5.3) | 17(3.2) | 19(4.1) | 34(6.9) | 25(4.8) | |
| Girls | ||||||||||
| Mean TC (mmol/L) | 4.30 | 4.59 | 4.34 | 4.47 | 4.47 | 4.41 | 4.51 | 4.60 | 4.52 | 0.02 (0.01, 0.03) |
| Standard deviation | 0.67 | 0.69 | 0.74 | 0.69 | 0.67 | 0.73 | 0.69 | 0.66 | 0.68 | |
| Number (%) of hyperlipidemia | ||||||||||
| Total | 485 | 567 | 568 | 480 | 537 | 464 | 463 | 451 | 469 | |
| TC ≥ 5.17 mmol/L | 44(9.1) | 114(20.1) | 65(11.4) | 64(13.3) | 65(12.1) | 67(14.4) | 78(16.8) | 96(21.3) | 88(18.8) | |
| TC ≥ 5.69 mmol/L | 13(2.7) | 35(6.2) | 15(2.6) | 20(4.2) | 17(3.2) | 19(4.1) | 20(4.3) | 28(6.2) | 26(5.5) | |
CI: confidence interval
Total cholesterol; 5.17 mmol/L = 200 mg/dL, 5.69 mmol/L = 220 mg/dL
TC level (mg/dL) × 0.02586 = TC level (mmol/L)
*: For evaluation of trends, simple regression analysis was used. The independent variable was the year of the examination, and the dependent variable was levels of cholesterol in each individual.
There were significant increases among prevalence of hyperlipidemia (TC≥5.17 mmol/L) during the survey year in both sexes by Mann-Whitney’s U test.