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Table 3 Incidence and risk of knee replacement (TKR) in relation to leisure time physical activity (LPA)

From: Leisure time physical activity and the risk of hip or knee replacement due to primary osteoarthritis: a population based cohort study (The HUNT Study)

      

Model 1a

    

Incidence rate

Age-adjusted

Total population

<45 years

45–59 years

≥60 years

LPA

No-of subjects

Person-years

No.of THRs

per 10 000 person-years

HR (95 % CI)

HR (95 % CI)

HR (95 % CI)

HR (95 % CI)

HR (95 % CI)

Women

 Inactive

2503

31 373

65

20.7

0.99 (0.75–1.30)

0.84 (0.58–1.22)

0.69 (0.16–2.93)

0.77 (0.40–1.49)

1.20 (0.73–1.99)

 Low

11 706

173 034

270

15.6

1

1

1

1

1

 Moderate

11 978

175 911

190

10.8

0.80 (0.66–0.96)

0.87 (0.70–1.10)

0.94 (0.51–1.74)

0.81 (0.59–1.12)

1.02 (0.70–1.50)

 High

8952

125 019

107

8.6

1.04 (0.82–1.31)

1.29 (1.00–1.67)

1.42 (0.78–2.61)

1.45 (1.03–2.04)

1.17 (0.70–1.98)

 p trend

    

0.47

0.09

0.20

0.09

0.99

Men

 Inactive

2411

32 978

34

10.3

1.12 (0.77–1.65)

1.13 (0.74–1.72)

0.27 (0.04–2.11)

1.33 (0.76–2.34)

1.32 (0.65–2.65)

 Low

7905

111 566

110

9.9

1

1

1

1

1

 Moderate

10 441

148 919

135

9.1

0.95 (0.74–1.22)

1.08 (0.81–1.43)

1.06 (0.50–2.25)

1.22 (0.83–1.81)

0.99 (0.60–1.63)

 High

11 068

160 906

105

6.5

0.88 (0.67–1.15)

0.96 (0.71–1.29)

0.99 (0.46–2.10)

1.07 (0.71–1.59)

0.85 (0.49–1.48)

 p trend

    

0.19

0.57

0.44

0.83

0.30

  1. aModel 1: adjusted for age at baseline, BMI and workload