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Table 1 Results for content validation of the low back pain survey questionnaire by content experts

From: Content validity and test-retest reliability of a low back pain questionnaire in Zimbabwean adolescents

Item number

Question description

Expert raters

I-CVIa

  

1

2

3

4

 

Q1

Lifetime prevalence

4

4

4

4

1.00

Q2

Age of onset

4

4

4

4

1.00

Q3

Recurrent NSLBPc

4

4

4

2

0.75

Q4

Frequency of recurrent NSLBP

4

4

4

3

1.00

Q5

Duration of recurrent NSLBP

2

4

4

4

0.75

Q6

Intensity of recurrent NSLBP

4

4

4

4

1.00

Q7

Sciatica

4

4

4

4

1.00

Q8

Point prevalence

4

4

4

4

1.00

Q9

Point pain intensity

4

4

4

4

1.00

Q10

Medical treatment

4

4

4

4

1.00

Q11a

Sitting on a chair

4

4

4

4

1.00

b)

Reaching up

4

4

4

4

1.00

c)

Standing

4

4

4

4

1.00

d)

Walking

4

4

4

4

1.00

e)

Sporting activity

4

4

4

4

1.00

f)

Bending

4

4

4

4

1.00

g)

School-bag carrying

4

4

4

4

1.00

h)

Sitting up in bed

4

4

4

4

1.00

i)

Running

4

4

4

4

1.00

Q12

Absenteeism

3

4

4

4

1.00

Q13

Bag carriage

4

4

4

4

1.00

Q14

Perception school-bag weight

4

4

4

3

1.00

Q15

Duration of carrying school-bag

3

4

4

4

1.00

Q16

Method of carrying school-bag

4

4

4

4

1.00

Q17

Sports participation

4

4

4

4

1.00

Q18

Type of sport

4

4

4

4

1.00

Q19

Sports duration

4

4

4

4

1.00

Q20

Sedentary time

3

4

4

4

1.00

Q21

Smoking

4

4

4

1

0.75

Q22

Past week smoking

4

4

4

1

0.75

 

dTotal agreement=0.86 bS-CVI/Ave = 0.97

  1. aI-CVI (Item content validity index) =computed as the number of content valid experts giving a rating of either 3 (quite relevant) or 4 (highly relevant), divided by the total number of experts.
  2. bS-CVI/Ave (scale content validity index) =computed as the average I-CVIs for all the items in the questionnaire.
  3. cNSLBP= non-specific low back pain
  4. dTotal agreement= the number of items that achieved the I-CVI of 1.00 divided by the total number of items to be validated in the questionnaire