Table 1.

Characteristics of patients with SF-36 data 6 to 18 months after initiation of HD (n = 11,079)

YearPatients with SF-36 Completed 6 to 18 Months of Starting HD [N (% of total cohort)]Mean Interval (days) Between Starting HD and SF-36 Administration (SD)Mean Age (SD)MaleDiabetes as the Cause of ESRDNonwhiteaAnnual Mortality Rate of the CohortbSMR of All Hemodialysis Patients in DCI
1997999 (41.8%)328.2 (96.2)59.8 (15.3)50.0%48.4%45.1%7.3%0.90
19981103 (45.1%)323.7 (97.4)58.9 (15.3)53.8%51.7%46.3%7.1%0.95
19991186 (47.0%)312.8 (91.5)59.6 (15.6)55.7%48.4%42.3%8.4%0.98
20001152 (42.1%)297.1 (80.9)61.1 (14.8)52.3%51.0%39.1%10.6.%0.97
2001954 (34.9%)370.0 (102.6)60.6 (14.8)52.1%55.1%42.7%6.6%0.96
20021383 (48.4%)319.5 (91.9)60.6 (14.8)54.4%50.0%42.1%8.3%0.94
20031318 (48.2%)318.5 (93.1)61.5 (15.1)53.9%50.2%44.1%6.4%0.96
20041245 (46.4%)323.6 (92.1)61.4 (15.1)56.6%53.9%40.6%5.2%0.93
20051296 (48.8%)323.1 (92.1)61.5 (15.1)55.7%48.5%43.7%8.2%0.95
2006c443 (37.4%)288.7 (70.1)60.9 (15.3)53.7%50.8%45.4%8.6%0.92
Annual changedChange in likelihood of completing an SF-36 within 6–18 months per increasing calendar year: OR (95% CI) = 0.99/yr (0.98–1.00); P = 0.002eChange in the number of days between starting HD and SF-36 administration, per increasing calendar year: β coefficient (SE) = −0.67 days/yr (0.33) P = 0.045Change in age per increasing calendar year: β coefficient (SE) = +0.3 yr/yr (0.05) P < 0.0001fChange in likelihood of male gender per increasing calendar year: OR (95% CI) = 1.02/yr (1.00–1.03) P = 0.02Change in likelihood of diabetes as the cause of ESRD per increasing calendar year: OR (95% CI) = 1.0/yr (0.99–1.02); P = 0.5Change in likelihood of non-white race per increasing calendar year: OR (95% CI) = 0.99/yr (0.98–1.01); P = 0.4Change in one-year mortality rate per increasing calendar year: OR (95% CI) = 0.98 (0.96–1.01), P = 0.3
  • a Missing data (41 patients missing race).

  • b Mortality rate calculated for the 1-year period between 6 and 18 months after the initiation of HD.

  • c January to May.

  • d Calculated through linear regression (for age, mean time between starting dialysis and SF-36 score) and logistic regression (for the other parameters) with calendar year as the predictor variable.

  • e An incident patient was 0.99 times as likely to complete a SF-36 with each subsequent year after 1997.

  • f The mean age of the population increased by 0.3 per year between 1997 and 2006.

  • OR, odds ratio; CI, confidence interval; SF-36, short form-36; SMR, standardized mortality ratio.