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Table 2 The numerical rating scale (NRS) score, Roland-Morris Disability Questionnaire (RDQ) score, and impact on work at baseline 2015, stratified by low back pain (LBP)

From: Psychosocial work characteristics and low back pain in daycare (nursery) workers in Japan: a prospective cohort study

LBP

Subjects at baseline

LBP status one year later

Present

(n= 270)

Absent

(n= 174)

Persistent

(n= 176)

Onset

(n= 45)

NRS score

3.6 (2.0) a

0.7 (1.1) b

3.7 (2.1) c

1.2 (1.2)

RDQ score

1.7 (2.7) d

0.1 (0.4) e

1.8 (2.8) f

0.1 (0.5)

Impact on work g

  I cannot work without taking occasional days off.

0

0

0

0

  I cannot work without taking a break sometimes.

6 (2.2%)

0

5 (2.8%)

0

  It hurts a lot, but I do not need to take a break.

45 (16.7%)

0

32 (18.2%)

0

  I feel slight pain occasionally.

201 (74.4%)

54 (31.0%)

129 (73.3%)

22 (48.9%)

  I would like a break or day off, but I cannot.

5 (1.9%)

1 (0.6%)

4 (2.3%)

0

  I do not have severe pain.

11 (4.1%)

119 (68.4%)

5 (2.8%)

23 (51.1%)

  1. The numbers of missing responses: a) 6, b) 4, c) 4, d) 2, e) 3, and f) 1
  2. g) The number of missing responses: 2 for participants with LBP in 2015 and 1 for those with persistent LBP in 2016