| Men (n = 2218) | Women (n = 383) | p Value§ | p Value¶ | |||
| Prevalence % (n*) | “Incidence”† % (n1/n2)‡ | Prevalence % (n) | “Incidence”† % (n1/n2)‡ | |||
| LBP at least 1 day | 54.9 (1218) | 29.5 (286/970) | 56.1 (215) | 31.4 (59/188) | NS | NS |
| LBP for more than 30 days | 15.1 (335) | 8.5 (154/1803) | 18.5 (71) | 10.5 (32/304) | NS | NS |
| LBP radiating to the leg | 16.9 (375) | 9.9 (174/1752) | 24.8 (95) | 17.6 (52/295) | 0.0002 | <0.0001 |
| LBP radiating below the knee | 7.8 (174) | 4.7 (95/2003) | 11.5 (44) | 9.3 (32/344) | 0.0175 | 0.0006 |
NS, not significant.
*Number of subjects suffering from this type of LBP in 2000.
†”Incidence” is defined here as the number of subjects suffering from a given LBP in 2000 among those free of it in 1995.
‡n1: number of subjects suffering from this type of LBP in 2000 and free of it in 1995; n2: number of subjects free of this type of LBP in 1995.
§Comparison between men and women for prevalence.
¶Comparison between men and women for “incidence”.