Table 2.

Parameters of the PTH–calcium curve before and after calcitriol treatment in responders and nonresponders to calcitriol treatmenta

ParameterResponders(n = 25)Nonresponders(n = 25)
Maximal PTH (pg/ml)
    pre1172 ± 1081899 ± 170b
    post599 ± 70c2001 ± 312b
Basal PTH (pg/ml)
    pre586 ± 51959 ± 80b
    post197 ± 26d969 ± 85d
Basal/maximal PTH (%)
    pre52 ± 352 ± 2
    post33 ± 3c54 ± 3b
Set point of calcium (mM)
    pre1.08 ± 0.021.08 ± 0.03
    post1.13 ± 0.02c1.13 ± 0.02c
  • a Data are means ± SEM. Reprinted from reference (70), with permission.

  • b P < 0.01, responders versus nonresponders.

  • c P < 0.01, pre- versus post-calcitriol.

  • d Basal PTH pre- versus post-calcitriol different or not different by definition.