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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