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Table 3 The relationship between characteristics and grade 2-3 in MRI high signal of menisci among workers in Korea national park service (Adjusted)

From: Risk factors for lesions of the knee menisci among workers in South Korea’s national parks

Variables Adjusteda
Model Ib Model IIc Model IIId
OR (95 % CI) OR (95 % CI) OR (95 % CI)
General characteristics
Sex Male 1 1 1
Female 3.71 (0.48 ~ 28.66) 3.80 (0.48 ~ 30.41) 3.41 (0.42 ~ 27.58)
Age (year) <45 1 1 1
≥45 0.82 (0.19 ~ 3.63) 1.21 (0.46 ~ 3.17) 1.28 (0.51 ~ 3.21)
BMI <25 1 1 1
≥25 1.14 (0.49 ~ 2.67) 1.26 (0.53 ~ 2.95) 1.25 (0.53 ~ 2.94)
Smoking Never or past 1 1 1
Current 0.71 (0.26 ~ 1.98) 0.61 (0.21 ~ 1.74) 0.60 (0.21 ~ 1.72)
Alcohol drinking <1 times/week 1 1 1
≥1 times/week 0.99 (0.43 ~ 2.25) 0.85 (0.36 ~ 1.99) 0.90 (0.39 ~ 2.12)
Regular exercise Once a week or more 1 1 1
Less than once a week 2.78 (0.71 ~ 10.85) 2.76 (0.70 ~ 10.97) 2.73 (0.70 ~ 10.64)
Previous exercise-related knee injury No 1 1 1
Yes 1.00 (0.38 ~ 2.60) 1.09 (0.41 ~ 2.89) 1.03 (0.39 ~ 2.69)
Previous accident-related knee injury No 1 1 1
Yes 1.92 (0.78 ~ 4.70) 2.05 (0.83 ~ 5.06) 1.95 (0.79 ~ 4.82)
Previous work-related knee injury No 1 1 1
Yes 1.47 (0.64 ~ 3.38) 1.59 (0.68 ~ 3.70) 1.60 (0.69 ~ 3.74)
Previous knee pain No 1 1 1
Yes 1.21 (0.43 ~ 3.44) 1.21 (0.42 ~ 3.51) 1.22 (0.42 ~ 3.52)
Past medical history No 1 1 1
Yes 1.25 (0.45 ~ 3.46) 1.09 (0.39 ~ 3.06) 1.17 (0.42 ~ 3.24)
Occupational characteristics
Overtime labor No 1 1 1
Yes 0.98 (0.34 ~ 2.83) 1.02 (0.35 ~ 2.94) 1.04 (0.36 ~ 3.03)
Holiday use Yes 1 1 1
No 0.63 (0.08 ~ 4.75) 0.56 (0.07 ~ 4.25) 0.65 (0.08 ~ 5.26)
Physical burden of work Low 1 1 1
High 0.80 (0.27 ~ 2.39) 0.67 (0.21 ~ 2.16) 0.66 (0.21 ~ 2.12)
Stair flight No 1 1 1
Yes 2.36 (0.79 ~ 7.04) 2.72 (0.90 ~ 8.26) 2.49 (0.83 ~ 7.53)
Kneeling No 1 1 1
Yes 0.82 (0.26 ~ 2.53) 0.62 (0.21 ~ 2.16) 0.59 (0.19 ~ 1.87)
The cumulative intensity of trekking <17 years 1   
≥17 years 2.81 (0.63 ~ 12.60)   
Low   1 1
Medium   1.79 (0.70 ~ 4.61) 2.02 (0.80 ~ 5.11)
High   4.08 (1.00 ~ 16.61) 5.84 (1.09 ~ 31.26)
  1. aCalculated by multiple logistic regression analysis
  2. bAdjusted for general characteristics(sex, age, BMI, smoking, alcohol drinking, regular exercise, previous knee injury, previous knee pain, past medical history), occupational characteristics(overtime labor, holiday use, physical burden of work, stair flight, kneeling), the cumulative intensity of trekking 1 (= Tenure)
  3. cAdjusted for general and occupational characteristics, the cumulative intensity of trekking 2
  4. dAdjusted for general and occupational characteristics, the cumulative intensity of trekking 3