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Table 3 Description of the study sample consisting of 412 40-yr old Danes from the general population

From: Self-reported hard physical work combined with heavy smoking or overweight may result in so-called Modic changes

Sex  
Men 199
Women 213
LBP some time past yr (LBPyear)  
Yes 284
No 128
LBP altogether for at least 30 days past yr (LBPlong)  
Yes 102
No 310
Disc degeneration (DD)  
Yes 214
No 198
Disc degeneration with signs of marrow changes consistent with a vertebral inflammatory process, type 1 or type 2 lesion (VIP)  
Yes 73
No 339
Smoking  
0 cigarettes/wk 169
1–19 cigarettes/wk 172
≥20 cigarettes/wk 70
missing data 1
BMI  
underweight 20
normal weight 214
overweight 115
heavy overweight 60
missing data 3
Work  
Mainly sitting 89
Sitting/walking 144
Light physical 92
Hard physical 84
Missing data 3