Skip to main content

Table 3 Crude incident rates (number of events per 1000 patient years of risk) for all-cause mortality, cardiovascular mortality and commencement of renal replacement therapy according to baseline phosphate categories

From: Serum phosphate and social deprivation independently predict all-cause mortality in chronic kidney disease

A. All-cause mortality
Phosphate categories Number of patients at risk Number of events Follow-up time (months) Crude incidence rate 95 % confidence interval P value*
<0.90 mmol/L 422 39 18.89 (10.94–32.46) 50.82 (34.87–66.77) <0.001
0.90–1.09 mmol/L 912 96 21.90 (11.47–33.66) 54.38 (43.50–65.26) Ref.
1.10–1.29 mmol/L 1004 130 21.68 (11.37–34.29) 67.48 (55.88–79.08) <0.001
1.30–1.49 mmol/L 435 64 20.30 (11.63–32.23) 78.90 (59.57–98.23) <0.001
≥1.50 mmol/L 177 46 17.58 (6.85–32.00) 154.94 (110.17–199.72) <0.001
Total 2950 375 20.57 (11.14–33.48) 67.36 (60.54–74.18)  
B. Cardiovascular mortality
Phosphate categories Number of Patients at risk Number of Events Follow-up time (months) Crude Incidence Rate 95 % Confidence Interval P value*
<0.90 mmol/L 422 6 18.89 (10.94–32.46) 7.82 (1.56–14.07) 0.003
0.90–1.09 mmol/L 912 18 21.90 (11.47–33.66) 10.20 (5.49–14.91) Ref.
1.10–1.29 mmol/L 1004 24 21.68 (11.37–34.29) 12.46 (7.47–17.44) 0.037
1.30–1.49 mmol/L 435 6 20.30 (11.63–32.23) 7.40 (1.48–13.32) <0.001
≥1.50 mmol/L 177 13 17.58 (6.85–32.00) 43.79 (19.98–67.59) <0.001
Total 2950 67 20.57 (11.14–33.48) 12.03 (9.15–14.92)  
C. Renal Replacement Therapy
Phosphate categories Number of Patients at risk Number of Events Follow-up time (months) Crude Incidence Rate 95 % Confidence Interval P value*
<0.90 mmol/L 422 4 18.79 (10.93–32.36) 5.24 (0.10–10.38) <0.001
0.90–1.09 mmol/L 912 14 21.65 (11.18–33.63) 8.00 (3.81–12.18) Ref.
1.10–1.29 mmol/L 1004 21 20.91 (11.07–33.64) 11.05 (6.32–15.78) 0.004
1.30–1.49 mmol/L 435 26 19.42 (11.07–31.27) 33.26 (20.48–46.05) <0.001
≥1.50 mmol/L 177 33 13.63 (4.78–28.09) 133.96 (88.25–179.67) <0.001
Total 2950 98 19.88 (10.68–32.92) 18.01 (14.44–21.75)  
  1. *P value for comparison with the reference group. Follow-up time is given as median (interquartile range)