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Table 6 Multivariate analysis of trends and factors associated with incidence for primary THA

From: Trends in primary total hip arthroplasty in Spain from 2001 to 2008: Evaluating changes in demographics, comorbidity, incidence rates, length of stay, costs and mortality

   INCIDENCE OF HOSPITALIZATIONS FOR THA
   Risk Rate Ratios (95% Confidence Intervals)*
   Men Women Both
Age 40-54 - - -
  55-64 2.96(2.89-3.03) 4.30 (4.17-4.43) 3.40 (3.34-3.46)
  65-74 5.65 (5.52-5.77) 12.04 (11.71-12.38) 7.84 (7.71-7.97)
  75-84 5.98 (5.84-6.12) 14.57 (14.17-14.98) 9.09 (8.93-9.25)
  ≥85 2.37 (2.25-2.50) 6.37 (6.14-6.21) 3.97 (3.86-4.08)
Sex Women NA NA -
  Men NA NA 1.03 (1.02-1.04)
Reason for surgery OA - - -
  Other 0,21 (0,20-0,22) 0,42 (0,41-0,43) 0,32 (0,31-0,33)
Charlson comorbidity index 0 - - -
  1-2 0.24 (0.24-0.25) 0.25 (0.25-0.26) 0.25 (0.24-0.25)
  >2 0.012 (0.011-0.013) 0.008 (0.008-0.009) 0.010 (0.009-0.011)
YEAR 2001 - - -
  2002 1.04 (1.00-1.07) 1.04 (1.01-1.07) 1.04 (1.02-1.06)
  2003 1.06 (1.03-1.09) 1.04 (1.01-1.07) 1.05 (1.03-1.07)
  2004 1.04 (1.01-1.07) 1.04 (1.01-1.07) 1.04 (1.02-1.06)
  2005 1.09 (1.06-1.12) 1.04 (1.01-1.07) 1.06 (1.04-1.08)
  2006 1.11 (1.08-1.15) 1.05 (1.02-1.08) 1.08 (1.06-1.10)
  2007 1.11 (1.08-1.15) 1.04 (1.01-1.07) 1.07 (1.05-1.09)
  2008 1.15 (1.11-1.18) 1.07 (1.04-1.09) 1.10 (1.08-1.12)
  1. Calculated using multivariate Poisson regression Dependent variable "Incidence of hospitalizations for THA".
  2. The independent variables included in the models are those shown in the table.
  3. OA Osteoarthritis