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Table 2 Changes between baseline and follow-up in prevalence of symptoms and diagnoses in neck and/or shoulders for the subjects who received prismatic glasses (Intervention) as well as from the referents (Referent)

From: Opting to wear prismatic spectacles was associated with reduced neck pain in dental personnel: a longitudinal cohort study

 

Intervention

Referent

p-valuea

Questionnaire

n = 236

n = 130

 

Complaints frequency

   

 Worse

21 (9)

26 (20)

 

 Unchanged

123 (52)

57 (44)

 

 Better

92 (39)

47 (36)

0.060

Perceived exertionb

   

 Worse

55 (24)

44 (35)

 

 Unchanged

49 (21)

33 (26)

 

 Better

129 (55)

48 (38)

0.003

Clinical examination (HECO)

n = 232

n = 89

 

Musculoskeletal painc

   

 Worse

20 (9)

13 (15)

 

 Unchanged

167 (74)

66 (75)

 

 Better

39 (17)

9 (10)

0.047

One or more diagnoses

   

 Worse

19 (8)

9 (10)

 

 Unchanged

186 (80)

79 (89)

 

 Better

27 (12)

1 (1)

0.025

Work ability

   

 Worse

51 (25)

23 (30)

 

 Unchanged

82 (40)

39 (51)

 

 Better

71 (35)

14 (18)

0.040

  1. aLinear-by-Linear Association
  2. b3 missing in the intervention group and 5 missing in the referent group
  3. c6 missing in the intervention group and 1 missing in the referent group
  4. Values presented are number (%)