Table 5.
Comparison of distribution across dichotomous nominal variables (coronary heart disease and DM status) using Mann-Whitney U test (U and Z statistics)
| Continuous variables | U | Z | p value |
|---|---|---|---|
| CHD (yes/no) | |||
| δiCa, mEq/La | 94.5 | −2.35 | <0.05 |
| iCaMB, mg/HDa | 90 | −2.47 | <0.05 |
| DM status (yes/no) | |||
| Intradialytic calcium buffer capacity, % of load/HDb | 95 | −2.75 | <0.01 |
| Vintage, daysb | 117 | −2.15 | <0.05 |
| Pulse pressure, mm Hgc | 108 | −2.39 | <0.05 |
iCaMB, ionized calcium mass balance; δiCa, ionized serum calcium increase; HD, hemodialysis; DM, diabetes mellitus; CHD, coronary heart disease.
a
Higher values are associated with the presence of coronary heart disease.
b
Lower values are associated with the presence of positive DM status.
c
Higher values are associated with the presence of positive DM status.