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Table 3 PRs (95% CIs) for self-reported LBP according to occupational class variables in 31,443 men

From: Occupational status and self-reported low back pain by gender: a nation-wide cross-sectional study among the general population in Japan

 

n

% LBP

Model 1

Model 2

Model 3

Age-adjusted

Multivariate-adjusteda

Mutually adjustedb

Occupation

Clerks

1737

8.7%

1.00

1.00

1.00

Managers

2608

8.9%

0.89 (0.73–1.08)

0.86 (0.71–1.05)

0.85 (0.70–1.04)

Professionals and technicians

6084

8.5%

0.97 (0.82–1.16)

0.96 (0.81–1.14)

0.94 (0.79–1.12)

Sales

1846

8.7%

0.99 (0.80–1.22)

0.97 (0.79–1.20)

0.94 (0.76–1.17)

Services

2925

8.8%

0.96 (0.79–1.16)

0.93 (0.77–1.12)

0.88 (0.72–1.07)

Security/protective

505

9.7%

0.99 (0.73–1.36)

0.95 (0.70–1.30)

0.93 (0.68–1.26)

Agricultural/forestry/fishery

993

12.2%

1.36 (1.11–1.68)

1.42 (1.15–1.75)

1.36 (1.08–1.70)

Manufacturing

2215

11.3%

1.13 (0.93–1.38)

1.09 (0.89–1.33)

1.06 (0.86–1.30)

Transportation/machine

993

9.1%

1.28 (1.02–1.61)

1.17 (0.93–1.47)

1.13 (0.89–1.42)

Construction/mining

1713

17.0%

1.21 (0.99–1.49)†

1.17 (0.96–1.44)

1.12 (0.91–1.39)

Carrying/cleaning/packing

775

11.5%

1.19 (0.93–1.52)

1.12 (0.87–1.44)

1.04 (0.80–1.34)

Other unclassified occupation

845

10.8%

1.10 (0.86–1.40)

1.12 (0.88–1.43)

1.05 (0.82–1.34)

Non-working

8204

17.4%

1.27 (1.08–1.50)

1.29 (1.09–1.53)

1.42 (1.18–1.70)

Employment status

Regular employees

14,249

8.2%

1.00

1.00

1.00

Part-timers and casual staff

1446

12.1%

1.22 (1.05–1.42)

1.26 (1.08–1.46)

1.25 (1.07–1.46)

Other types of non-regularc

1862

12.0%

1.18 (1.03–1.35)

1.19 (1.03–1.36)

1.18 (1.03–1.35)

Self-employed

5682

11.9%

1.11 (1.01–1.22)

1.15 (1.04–1.26)

1.12 (0.88–1.42)

Non-working

8204

17.4%

1.31 (1.19–1.44)

1.38 (1.24–1.52)

Not calculated

Company size (number of employees)

≥ 100 employees

9288

8.3%

1.00

1.00

1.00

1 to 4 employees

6356

11.7%

1.10 (0.999–1.22)

1.13 (1.02–1.25)

1.02 (0.80–1.29)

5 to 29 employees

3211

9.5%

1.08 (0.95–1.22)

1.06 (0.93–1.21)

1.02 (0.89–1.16)

30 to 99 employees

2796

10.4%

1.20 (1.06–1.37)

1.20 (1.06–1.37)

1.17 (1.03–1.34)

Public servants

1588

8.1%

0.94 (0.78–1.12)

0.97 (0.81–1.16)

0.99 (0.82–1.19)

Non-working

8204

17.4%

1.29 (1.16–1.42)

1.34 (1.20–1.49)

Not calculated

  1. CI confidence interval, LBP low back pain, PR prevalence ratio
  2. aAdjusted for age (per 5-year increase), marital status, family size, housing tenure, equivalent household expenditures, education, alcohol intake, smoking status, sleep duration, and chronic medical conditions
  3. bIn addition to model 2, all three items of occupational class variables were included (i.e., Model 3 was mutually adjusted for all occupational class variables)
  4. cTemporary employees, contract staff, contract-based workers, and fixed-term employees
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Environmental Health and Preventive Medicine

ISSN: 1347-4715

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