product (F = 404, p < 005) revealed statistically significant
Group 9 Time interactions. As shown in Table 3,
one-way repeated-measures ANOVA showed the levels of
serum phosphorus and the calcium–phosphorus product to
be decreased over time, and there were significant differences
(p < 0001) in the experimental group, while in the
control group no statistically significant differences were
found in the levels of serum phosphorus and the calcium–
phosphorus product over time (p > 005). Post hoc t-test
showed that the levels of serum phosphorus and calcium–
phosphorus product in the experimental group were lower
than those in the control group three and six months postintervention
(p < 001). As shown in Table 2, mean serum
phosphorus and calcium–phosphorus product levels
declined by 035 and 072, respectively, in the experimental
group at three months, and then, they were controlled
steadily at the end-of-study measure point.
Two-way repeated-measures ANOVA of serum calcium
(F = 003, p > 005) and albumin (F = 059, p > 005) levels
had no significant interaction effect, and also, the time
effect and group effect did not show the statistically significant
differences in them. As shown in Table 2, increased
serum calcium level was observed in both groups postintervention,
which was higher in the control group than in theexperimental group, but this change had no statistically significant
difference. Serum albumin was maintained in a similar
level both pre- and postintervention between the groups
(p > 005).
Mann–Whitney U-test showed there was no significant
difference in the level of parathyroid hormone between the
groups (Z = 189, p = 060) at six months.