Table 2

 Summarised results of crude prevalence and multiple logistic regression† for estimating the prevalence odds ratios of spondylolisthesis associated with personal and occupational factors

FactorsN (prevalence)‡Prevalence ORs and 95% CIs
Crude OR (95% CI)Adjusted OR (95% CI)¶
*p<0.05; **p<0.01.
†The Hosmer-Lemeshow test for the goodness-of-fit of the final adjusted model: p = 0.73
‡Number of subjects and crude prevalence of spondylolisthesis in each category. The total number of subjects slightly differed across categories because of missing data. A total of 1166 subjects were included in the final logistic model.
¶Adjusted for frequency of lifting tasks, bending and twisting, smoking habit, alcohol dinking, and all the other factors indicated in the table.
Professional seniority (years)
    ⩽5359 (1.1%)11
    6–15543 (2.4%)2.2 (0.7 to 6.7)1.9 (0.6 to 6.1)
    >15324 (7.1%)6.8 (2.3 to 19.8)**3.4 (1.1 to 10.7)*
    Trend testp<0.001p = 0.02
Age (years)
    ⩽45688 (1.3%)11
    46–55383 (4.7%)3.7 (1.7 to 8.4)**2.6 (1.1 to 6.6)*
    >55163 (8%)6.5 (2.7 to 15.6)**4.8 (1.8 to 12.9)**
    Trend testP<0.001p = 0.002
Gender
    Male1185 (3.1%)11
    Female49 (6.1%)2.0 (0.6 to 6.8)1.9 (0.5 to 7.2)
Body mass index (kg/m2)
    <25644 (2.1%)11
    ⩾25550 (4.5%)2.2 (1.1 to 4.2)*2.2 (1.1 to 4.6)*
Frequent strenuous exercise
    No939 (2.6%)11
    Yes293 (5.5%)2.2 (1.2 to 4.2)*2.2 (1.1 to 4.5)*