Table 2

Association between severity of LBP (number of days with LBP in the preceding 12 months) and lifetime duration of recurrent LBP in years

Cohort 91–92Cohort 92–99
Number of days with LBP within preceding 12 months at baselinenDuration of recurrent LBP (y)* at baselinenDuration of recurrent LBP (y)* at baseline
*Mean (SD).
0 days510.0 (11.2)911.2 (8.8)
1–7 days1269.4 (6.8)1659.4 (6.8)
8–30 days1379.0 (6.3)1769.1 (6.5)
>30 days729.6 (7.6)6811.8 (9.1)
ANOVAF=0.14, p=0.9F=2.73, p=0.04