Table 1 Evaluation of regression model fit after inflection point determination
Parameter | AIC | Residual variance | P-value |
|---|---|---|---|
Inflection point of TDB | |||
  Mild HS | |||
    Late-gestation | 1914.00 | 109.66 | 0.01 |
    Mid-gestation | 1899.00 | 46.49 | 0.02 |
    Non-pregnant | 1589.50 | 47.83 | < 0.01 |
  Moderate HS | |||
    Late-gestation | –28.90 | 0.03 | 0.04 |
    Mid-gestation | –46.20 | 0.03 | 0.02 |
    Non-pregnant | 76.00 | 0.06 | 0.01 |
  Severe HS | |||
    Late-gestation | –28.90 | 0.03 | 0.03 |
    Mid-gestation | –46.20 | 0.03 | < 0.01 |
    Non-pregnant | 76.00 | 0.06 | 0.01 |
TDB minus TDB breakpoint | |||
  Mild HS | |||
    Late-gestation | 1888.80 | 88.17 | 0.04 |
    Mid-gestation | 1851.40 | 45.57 | 0.04 |
    Non-pregnant | 1542.20 | 42.90 | 0.02 |
  Moderate HS | |||
    Late-gestation | –52.30 | 0.02 | < 0.01 |
    Mid-gestation | –57.80 | 0.03 | 0.02 |
    Non-pregnant | 42.40 | 0.05 | 0.03 |
  Severe HS | |||
    Late-gestation | –41.50 | 0.01 | 0.01 |
    Mid-gestation | –69.70 | 0.02 | 0.04 |
    Non-pregnant | 38.30 | 0.04 | 0.04 |
Inflection point of DP | |||
  Mild HS | |||
    Late-gestation | 1918.10 | 106.99 | < 0.01 |
    Mid-gestation | 1889.00 | 44.07 | < 0.01 |
    Non-pregnant | ND | ND | 0.67 |
  Moderate HS | |||
    Late-gestation | –33.20 | 0.03 | 0.01 |
    Mid-gestation | –53.30 | 0.03 | 0.02 |
    Non-pregnant | ND | ND | 0.21 |
  Severe HS | |||
    Late-gestation | –41.50 | 0.01 | < 0.01 |
    Mid-gestation | –69.70 | 0.02 | < 0.01 |
    Non-pregnant | ND | ND | 0.22 |
DP minus DP breakpoint | |||
  Mild HS | |||
    Late-gestation | 1855.60 | 84.38 | 0.03 |
    Mid-gestation | 1823.90 | 21.67 | 0.02 |
    Non-pregnant | ND | ND | 0.54 |
  Moderate HS | |||
    Late-gestation | –59.00 | 0.02 | < 0.01 |
    Mid-gestation | –65.60 | 0.03 | < 0.01 |
    Non-pregnant | ND | ND | 0.87 |
  Severe HS | |||
    Late-gestation | –66.90 | 0.01 | 0.01 |
    Mid-gestation | –70.40 | 0.01 | 0.02 |
    Non-pregnant | ND | ND | 0.43 |