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

Sex

Male

1

Female

2.12 (0.41 ~ 10.94)

Age (year)

<45

1

≥45

2.09 (1.00 ~ 4.37)

BMI

<25

1

≥25

1.11 (0.53 ~ 2.32)

Smoking

Never or past

1

Current

0.71 (0.31 ~ 1.65)

Alcohol drinking

<1 times/week

1

≥1 times/week

0.69 (0.33 ~ 1.41)

Regular exercise

Once a week or more

1

Less than once a week

2.01 (0.60 ~ 6.71)

Previous exercise-related knee injury

No

1

Yes

1.13 (0.50 ~ 2.53)

Previous accident-related knee injury

No

1

Yes

1.96 (0.91 ~ 4.23)

Previous work-related knee injury

No

1

Yes

1.81 (0.88 ~ 3.75)

Previous knee pain

No

1

Yes

1.62 (0.64 ~ 4.08)

Past medical history

No

1

Yes

2.04 (0.90 ~ 4.62)

Overtime labor

No

1

Yes

0.94 (0.37 ~ 2.38)

Holiday use

Yes

1

No

1.01 (0.16 ~ 6.30)

Physical burden of work

Low

1

High

1.34 (0.52 ~ 3.43)

Stair flight

No

1

Yes

2.05 (0.86 ~ 4.92)

Kneeling

No

1

Yes

1.16 (0.46 ~ 2.90)

The cumulative intensity of trekking 1

<17 years

1

(= Tenure)

≥17 years

2.64 (1.25 ~ 5.59)

The cumulative intensity of trekking 2

Low

1

Medium

1.66 (0.73 ~ 3.77)

High

3.47 (1.21 ~ 9.96)

The cumulative intensity of trekking 3

Low

1

Medium

2.07 (0.94 ~ 4.55)

High

5.65 (1.41 ~ 22.61)