Doctor-led intensive diet education on health-related quality of life in patients with chronic renal failure and hyperphosphatemia

Table 2 Comparison of blood parathyroid hormone, calcium, phosphorus, and calcium-phosphorus product levels between the two groups (mean ± SD)

Group	Number of examples	Time	Blood, iPTH (pg/mL)	Blood-based Ca (mmol/L)	Blood-P (mmol/L)	Ca × P (mmol2/L2)
Control group	60	Before the intervention	379.63 ± 43.25	2.30 ± 0.25	2.15 ± 0.36	4.82 ± 0.69
		Intervention for 3 mo	312.36 ± 36.21a	2.19 ± 0.22a	2.02 ± 0.29a	4.61 ± 0.56a
		Intervention for 6 mo	295.69 ± 21.44a	2.11 ± 0.26a	2.05 ± 0.25a	4.55 ± 0.56a
Observation group	60	Before the intervention	383.45 ± 42.96	2.28 ± 0.26	2.19 ± 0.33	1.78 ± 0.78
		Intervention for 3 mo	296.88 ± 28.02a,d	2.11 ± 0.21a,d	1.73 ± 0.31a,d	4.15 ± 0.46 a,d
		Intervention for 6 mo	249.63 ± 23.44a,d	2.08 ± 0.26a,d	1.70 ± 0.26a,d	4.08 ± 0.49a,d

^aP < 0.05 vs those before intervention in this group.

^dP < 0.05 vs the control group.

iPTH: Serum parathyroid hormone; Ca: Calcium; P: Phosphorus; Ca × P calcium-phosphorus product.