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. Author manuscript; available in PMC: 2017 Jan 1.
Published in final edited form as: Ann Rheum Dis. 2016 May 17;76(1):140–146. doi: 10.1136/annrheumdis-2016-209167

Table 2.

Relation of KR to mortality risk by age quartiles in a propensity score-matched* cohort of men and women with knee osteoarthritis

Age (years) quartiles KR Non-KR HR (95% CI)
Death (N) PY Mortality rate
(N/1000 PY)		 Death (N) PY Mortality rate
(N/1000 PY)
Q1: ≤63   76 12480.9   6.09   67 12509.8   5.36 1.20 (0.84 to 1.71)
Q2: >63 and ≤71 230 19455.5 11.82 289 18918.2 15.28 0.80 (0.66 to 0.96)
Q3: >71 and ≤79 503 20556.7 24.47 618 20164.3 30.65 0.75 (0.66 to 0.86)
Q4: >79 350   8299.2 42.17 444   7817.0 56.80 0.65 (0.55 to 0.77)

Test for interaction p<0.0001.

*

Propensity score derived using covariates listed in table 1.

KR, knee replacement; N, number; PY, person-years.