Table 4.
Frequency and percentage of control subjects and periodontitis patients whose serum and urine biochemical markers for kidney function are below, within and above their respective reference intervals.
| Control | Test | |||||
|---|---|---|---|---|---|---|
| Variable | Classes | Fr | % | Fr | % | RI |
| Serum albumin (g/dL) | within RI | 21 | 70.0 | 25 | 83.3 | 3.5 – 5.2 [25] |
| < RI | 1 | 3.3 | 0 | 0.0 | ||
| > RI | 8 | 26.7 | 5 | 16.7 | ||
| Serum Creatinine (mg/dL) | within RI | 29 | 96.7 | 29 | 96.7 | M: 0.9 – 1.3 [25] |
| < RI | 1 | 3.3 | 1 | 3.3 | W: 0.6 – 1.1 | |
| Urinary Creatinine (mg/kg.24hs) | within RI | 11 | 36.7 | 9 | 30.0 | M: 21 – 26 [26] |
| < RI | 16 | 53.3 | 20 | 66.7 | W: 16 – 22 | |
| > RI | 3 | 10.0 | 1 | 3.3 | ||
| Serum uric acid (mg/dL) | within RI | 23 | 76.7 | 21 | 70.0 | M: 3.5 – 7.2 [25] |
| < RI | 4 | 13.3 | 5 | 16.7 | W: 2.6 – 6.0 | |
| > RI | 3 | 10.0 | 4 | 13.3 | ||
| Urinary uric acid (mg/24h) | within RI | 28 | 93.3 | 29 | 96.7 | < 1000 [25] |
| > RI | 2 | 6.7 | 1 | 3.3 | ||
| Serum urea (mg/dL) | within RI | 25 | 83.3 | 25 | 83.3 | 15 – 40 [27] |
| < RI | 1 | 3.3 | 0 | 0 | ||
| > RI | 4 | 13.3 | 5 | 16.7 | ||
| Urinary urea (g/24hs) | within RI | 12 | 40.0 | 8 | 26.7 | 26 – 43 [27] |
| < RI | 17 | 56.7 | 18 | 60.0 | ||
| > RI | 1 | 3.3 | 4 | 13.3 | ||
M: men; W: women; RI: reference interval; Fr: frequency, i.e. number of subjects in each class with respect to RI. Statistical analysis: c2 test (P<.05). Superscripts in square brackets indicate sources.