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Table 4 PRs (95% CIs) for self-reported LBP according to occupational class variables in 35,870 women

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

4260

9.4%

1.00

1.00

1.00

Managers

359

10.0%

0.87 (0.63–1.20)

0.88 (0.64–1.22)

0.87 (0.63–1.21)

Professionals and technicians

4110

11.9%

1.26 (1.11–1.42)

1.26 (1.11–1.42)

1.26 (1.11–1.43)

Sales

1687

13.0%

1.29 (1.10–1.50)

1.25 (1.07–1.46)

1.22 (1.04–1.43)

Services

4357

12.2%

1.20 (1.06–1.35)

1.14 (1.01–1.29)

1.12 (0.98–1.27)

Security/protective

16

6.3%

0.73 (0.11–4.95)

0.69 (0.10–4.84)

0.67 (0.10–4.70)

Agricultural/forestry/fishery

613

21.9%

1.52 (1.27–1.82)

1.63 (1.35–1.95)

1.59 (1.30–1.93)

Manufacturing

1172

11.8%

1.14 (0.95–1.37)

1.09 (0.91–1.31)

1.07 (0.89–1.29)

Transportation/machine

30

16.7%

1.64 (0.75–3.60)

1.39 (0.62–3.12)

1.37 (0.61–3.06)

Construction/mining

78

14.1%

1.30 (0.74–2.29)

1.27 (0.71–2.27)

1.25 (0.70–2.24)

Carrying/cleaning/packing

555

14.8%

1.28 (1.03–1.60)

1.17 (0.94–1.46)

1.13 (0.90–1.42)

Other unclassified occupation

764

12.4%

1.16 (0.94–1.43)

1.13 (0.92–1.40)

1.11 (0.90–1.37)

Non-working

17,869

16.6%

1.19 (1.08–1.33)

1.20 (1.08–1.33)

1.23 (1.08–1.40)

Employment status

Regular employees

6297

9.8%

1.00

1.00

1.00

Part-timers and casual staff

6495

12.3%

1.10 (0.99–1.21)

1.09 (0.98–1.21)

1.10 (0.99–1.23)

Other types of non–regularc

1687

11.6%

1.09 (0.94–1.27)

1.08 (0.93–1.26)

1.08 (0.93–1.26)

Self-employed

3522

14.9%

1.08 (0.97–1.21)

1.15 (1.02–1.28)

1.24 (0.98–1.57)

Non-working

17,869

16.6%

1.07 (0.98–1.17)

1.11 (1.01–1.22)

Not calculated

Company size (number of employees)

≥100 employees

6617

11.3%

1.00

1.00

1.00

1 to 4 employees

4261

14.2%

0.96 (0.87–1.07)

1.02 (0.92–1.13)

0.85 (0.69–1.06)

5 to 29 employees

3411

11.1%

0.94 (0.83–1.05)

0.94 (0.84–1.06)

0.94 (0.84–1.06)

30 to 99 employees

2628

11.1%

0.95 (0.83–1.08)

0.95 (0.84–1.08)

0.95 (0.84–1.08)

Public servants

1084

11.3%

0.97 (0.81–1.16)

1.05 (0.88–1.26)

1.06 (0.88–1.28)

Non-working

17,869

16.6%

0.97 (0.89–1.05)

1.01 (0.92–1.10)

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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