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Table 1 Equations for regression lines and confidence ranges

From: Estimation of daily cadmium intake from cadmium in blood or cadmium in urine

Survey X Y Typea Equation   
The 1991–1997 survey (n = 30)   
  Cd-B Cd-D 95 % UL \( {\text{Y}} = + 10.18 + 7.19{\text{X}} + 1.772{\text{X}}^{2} \)   Eq. 1
  (μg/l) (μg/day) RL \( {\text{Y}} = - 1.13 + 14.36{\text{X}} \) r = 0.76b Eq. 2
    95 %LL \( {\text{Y}} = - 12.43 + 21.54{\text{X}} - 1.772{\text{X}}^{2} \)   Eq. 3
  Cd-Ucr Cd-D 95 % UL \( {\text{Y}} = + 12.84 + 3.33{\text{X}} + 0.169{\text{X}}^{2} \)   Eq. 4
  (μg/g cr) (μg/day) RL \( {\text{Y}} = + 5.35 + 4.90{\text{X}} \) r = 0.79b Eq. 5
    95 %LL \( {\text{Y}} = - 2.13 + 6.48{\text{X}} - 0.169{\text{X}}^{2} \)   Eq. 6
The 1977–1981 survey (n = 18)   
  Cd-B Cd-D 95 % UL \( {\text{Y}} = + 33.88 - 6.45{\text{X}} + 3.214{\text{X}}^{2} \)   
  (μg/l) (μg/day) RL \( {\text{Y}} = - 20. 3 2+ 1 7. 5 2 {\text{X}} \) r = 0.68c  
    95 %LL \( {\text{Y}} = - 74.53 + 41.49{\text{X}} - 3.214{\text{X}}^{2} \)   
  1. aThe equations are regression line (RL) and 95 %upper (95 % UL) or lower limit (95 % LL)
  2. b p < 0.001 for both cases
  3. c p < 0.01