Table 4

Categorisation of the cumulative life doses

Tertile split


First tertile

Second tertile

Third tertile


Smoking (package-years)

Female

<9

9 to 20

>20

Male

<16.5

16.5 to 27

>27

Kneeling/squatting (hours/life)

Female

<3,542

3,542 to 8,934

>8,934

Male

<3,573

3,573 to 12,243

>12,243

Sitting (hours/life)

Female

<16,031

16,031 to 33,119

>33,119

Male

<15,180

15,180 to 34,960

>34,960


Median split


Low exposure

High exposure


Lifting and carrying (tons/life)

Female

<1,088

≥1,088

Male

<2,214

≥2,214

Sports with risk for unapparent trauma (hours/life)

Female

<1,440

≥1,440

Male

<3,232

≥3,232


Klussmann et al. Arthritis Research & Therapy 2010 12:R88   doi:10.1186/ar3015

Open Data