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Vitamin D status of the studied subjects according to serum iPTH‐based system‐specific cutoff points for 25(OH)D assay [n (%)]
| System | Deficient | Insufficient | Sufficient | P value |
|---|---|---|---|---|
| HPLC | 37 (13.7) | 105 (38.7) | 129 (47.6) | — |
| ECL‐Roche | 39 (14.7) | 110 (41.4) | 117 (44.0) | .174 |
| CLIA‐Diasorin | 30 (12.1) | 101 (40.7) | 117 (47.2) | .012 |
| EIA‐Diasource | 58 (21.8) | 98 (36.8) | 110 (41.4) | <.001 |
| RIA‐Diasource | 44 (19.6) | 87 (38.8) | 93 (41.5) | <.001 |
