Table 4 Correlation between the calculated LDL-C and directly measured LDL-C in different TG groups
Group | Method | Mean ± SD mg/dl (mmol/l) | Mean difference mg/dl (mmol/l) | Correlation (r) | p value |
|---|---|---|---|---|---|
TG < 100 mg/dl, n = 4369 | |||||
Direct LDL-C | 81.27 ± 25.30 (2.10 ± 0.65) | ||||
Friedewald LDL-C | 88.58 ± 30.46 (2.29 ± 0.79) | 7.31 (0.19) | 0.976 | < 0.001 | |
Sampson LDL-C | 88.81 ± 31.20 (2.30 ± 0.81) | 7.54 (0.20) | 0.978 | < 0.001 | |
TG 100 ~ 199 mg/dl, n = 6402 | |||||
Direct LDL-C | 97.47 ± 28.47 (2.52 ± 0.74) | ||||
Friedewald LDL-C | 99.54 ± 34.67 (2.57 ± 0.90) | 2.07 (0.05) | 0.966 | < 0.001 | |
Sampson LDL-C | 102.37 ± 34.40 (2.65 ± 0.89) | 4.90 (0.13) | 0.969 | < 0.001 | |
TG 200 ~ 299 mg/dl, n = 1489 | |||||
Direct LDL-C | 105.25 ± 29.68 (2.72 ± 0.77) | ||||
Friedewald LDL-C | 96.30 ± 37.16 (2.49 ± 0.96) | -8.95 (-0.23) | 0.960 | < 0.001 | |
Sampson LDL-C | 102.65 ± 35.11 (2.65 ± 0.91) | -2.60 (-0.07) | 0.963 | < 0.001 | |
TG 300 ~ 399 mg/dl, n = 401 | |||||
Direct LDL-C | 110.77 ± 31.09 (2.86 ± 0.80) | ||||
Friedewald LDL-C | 88.73 ± 40.19 (2.29 ± 1.04) | -22.04 (-0.57) | 0.950 | < 0.001 | |
Sampson LDL-C | 99.00 ± 35.90 (2.56 ± 0.93) | -11.77 (-0.30) | 0.952 | < 0.001 | |
TG 400 ~ 799 mg/dl, n = 279 | |||||
Direct LDL-C | 109.24 ± 32.85 (2.82 ± 0.85) | ||||
Friedewald LDL-C | 62.68 ± 45.18 (1.62 ± 1.17) | -46.56 (-1.20) | 0.931 | < 0.001 | |
Sampson LDL-C | 82.55 ± 36.04 (2.13 ± 0.93) | -26.69 (-0.69) | 0.948 | < 0.001 | |
TG ≥ 800 mg/dl, n = 49 | |||||
Direct LDL-C | 105.46 ± 27.68 (2.72 ± 0.72) | ||||
Friedewald LDL-C | -8.96 ± 73.66 (-0.23 ± 1.91) | -114.42 (-2.95) | 0.666 | < 0.001 | |
Sampson LDL-C | 56.36 ± 33.24 (1.46 ± 0.86) | -49.10 (-1.26) | 0.898 | < 0.001 | |