Table 7 Two-piecewise linear regression models of HDL-C on bone mineral density in females
Age Groups | Â | Index | |||
|---|---|---|---|---|---|
20≤Aged<30 |  | Total femur BMD | Femur neck BMD | Trochanter BMD | Intertrochanter BMD |
Fitting by the standard linear model | -0.0000 (-0.0007, 0.0006) 0.8952 | 0.0002 (-0.0005, 0.0008) 0.6136 | -0.0001 (-0.0007, 0.0004) 0.6102 | -0.0001 (-0.0009, 0.0006) 0.7263 | |
Fitting by the two-piecewise linear model | Â | Â | Â | Â | |
Inflection point (mg/dL) | 65 | 65 | 65 | 65 | |
HDL-C < Infection point | -0.0011 (-0.0021, -0.0001) 0.0257 | -0.0006 (-0.0016, 0.0004) 0.2539 | -0.0011 (-0.0019, -0.0002) 0.0141 | -0.0013 (-0.0024, -0.0002) 0.0228 | |
HDL-C > Infection point | 0.0016 (0.0003, 0.0028) 0.0170 | 0.0013 (-0.0000, 0.0026) 0.0549 | 0.0013 (0.0001, 0.0024) 0.0291 | 0.0016 (0.0002, 0.0031) 0.0298 | |
Log likelihood ratio | 0.004 | 0.05 | 0.004 | 0.006 | |
30≤Aged<40 |  | Total femur BMD | Femur neck BMD | Trochanter BMD | Intertrochanter BMD |
Fitting by the standard linear model | -0.0010 (-0.0017, -0.0004) 0.0021 | -0.0009 (-0.0016, -0.0003) 0.0056 | -0.0007 (-0.0013, -0.0002) 0.0127 | -0.0012 (-0.0019, -0.0004) 0.0023 | |
Fitting by the two-piecewise linear model | Â | Â | Â | Â | |
Inflection point (mg/dL) | 45 | 45 | 45 | 45 | |
HDL-C < Infection point | 0.0021 (-0.0007, 0.0048) 0.1389 | 0.0013 (-0.0014, 0.0041) 0.3443 | 0.0018 (-0.0006, 0.0043) 0.1444 | 0.0030 (-0.0002, 0.0062) 0.0626 | |
HDL-C > Infection point | -0.0015 (-0.0023, -0.0007) 0.0001 | -0.0013 (-0.0020, -0.0005) 0.0013 | -0.0012 (-0.0018, -0.0005) 0.0012 | -0.0018 (-0.0027, -0.0009) <0.0001 | |
Log likelihood ratio | 0.02 | 0.092 | 0.031 | 0.007 | |
50≤Aged<60 |  | Total femur BMD | Femur neck BMD | Trochanter BMD | Intertrochanter BMD |
Fitting by the standard linear model | -0.0010 (-0.0018, -0.0002) 0.0138 | -0.0010 (-0.0018, -0.0003) 0.0077 | -0.0007 (-0.0014, -0.0001) 0.0302 | -0.0012 (-0.0021, -0.0002) 0.0161 | |
Fitting by the two-piecewise linear model | Â | Â | Â | Â | |
Inflection point (mg/dL) | 70 | 70 | 70 | 70 | |
HDL-C < Infection point | -0.0025 (-0.0037, -0.0012) 0.0002 | -0.0017 (-0.0030, -0.0005) 0.0073 | -0.0015 (-0.0026, -0.0004) 0.0085 | -0.0032 (-0.0047, -0.0017) <0.0001 | |
HDL-C > Infection point | 0.0008 (-0.0007, 0.0022) 0.2960 | -0.0002 (-0.0016, 0.0012) 0.7467 | 0.0001 (-0.0011, 0.0014) 0.8311 | 0.0013 (-0.0004, 0.0030) 0.1407 | |
Log likelihood ratio | 0.003 | 0.161 | 0.084 | <0.001 | |
| Â | L1 BMD | L2 BMD | L3 BMD | L4 BMD | |
Fitting by the standard linear model | -0.0015 (-0.0025, -0.0006) 0.0021 | -0.0012 (-0.0023, -0.0002) 0.0228 | -0.0013 (-0.0024, -0.0003) 0.0122 | -0.0008 (-0.0018, 0.0002) 0.1087 | |
Fitting by the two-piecewise linear model | Â | Â | Â | Â | |
Inflection point (mg/dL) | 70 | 70 | 70 | 70 | |
HDL-C < Infection point | -0.0029 (-0.0044, -0.0013) 0.0004 | -0.0030 (-0.0047, -0.0013) 0.0006 | -0.0035 (-0.0052, -0.0018) <0.0001 | -0.0025 (-0.0041, -0.0009) 0.0023 | |
HDL-C > Infection point | 0.0001 (-0.0016, 0.0019) 0.8969 | 0.0009 (-0.0010, 0.0028) 0.3502 | 0.0013 (-0.0006, 0.0031) 0.1889 | 0.0012 (-0.0006, 0.0030) 0.1869 | |
Log likelihood ratio | 0.025 | 0.007 | <0.001 | 0.007 | |
60≤Aged |  | Total femur BMD | Femur neck BMD | Trochanter BMD | Intertrochanter BMD |
Fitting by the standard linear model | 0.0000 (-0.0009, 0.0009) 0.9655 | -0.0001 (-0.0008, 0.0007) 0.8637 | 0.0002 (-0.0006, 0.0009) 0.6423 | -0.0001 (-0.0011, 0.0010) 0.9103 | |
Fitting by the two-piecewise linear model | Â | Â | Â | Â | |
Inflection point (mg/dL) | 45 | 45 | 45 | 45 | |
HDL-C < Infection point | 0.0076 (0.0031, 0.0121) 0.0010 | 0.0056 (0.0017, 0.0095) 0.0050 | 0.0055 (0.0017, 0.0094) 0.0052 | 0.0096 (0.0041, 0.0151) 0.0007 | |
HDL-C > Infection point | -0.0008 (-0.0018, 0.0002) 0.1095 | -0.0007 (-0.0015, 0.0002) 0.1171 | -0.0004 (-0.0013, 0.0004) 0.3462 | -0.0011 (-0.0023, 0.0001) 0.0716 | |
Log likelihood ratio | <0.001 | 0.003 | 0.004 | <0.001 | |