. 2018 Apr 19;15:17. doi: 10.1186/s12970-018-0223-1

Table 1.

Comparison of methods used in the development and validation of the NSKQ and A-NSKQ

NSKQ development and validation	A-NSKQ validation
Development of the tool: 1. Define construct and develop test plan. 2. Generate items. 3. Choose scoring system Preliminary review of the items: 4. Assess content validity. 5. Asses face validity Further statistical analysis of measurement: 6. Purification of the scale using item analysis 7. Evaluate internal reliability and use of Rash analysis to assess item/person indicators, dimensionality and internal reliability Final analysis: 8. Re-examine questionnaire properties, assess temporal stability and confirm construct validity.	Using data from step (8) 1. Rash analysis to assess item/person indicators, dimensionality and internal reliability 2. Assess temporal stability and construct validity, using proxy-scores.

NSKQ development and validation

A-NSKQ validation

Development of the tool:
1. Define construct and develop test plan. 2. Generate items. 3. Choose scoring system
Preliminary review of the items:
4. Assess content validity. 5. Asses face validity
Further statistical analysis of measurement:
6. Purification of the scale using item analysis
7. Evaluate internal reliability and use of Rash analysis to assess item/person indicators, dimensionality and internal reliability
Final analysis:
8. Re-examine questionnaire properties, assess temporal stability and confirm construct validity.

Using data from step (8)
1. Rash analysis to assess item/person indicators, dimensionality and internal reliability
2. Assess temporal stability and construct validity, using proxy-scores.