Table 1.

Summary of instruments and measurement times

Study variable	Measure	Timing
Baseline maternal information	Baseline questionnaire	Prior to randomization
Primary outcome		Baseline and at 4 days post‐randomization
1. Pain intensity	11‐point NRS
Secondary outcomes
1. Breastfeeding duration	Breastfeeding or not	4 and 7 days post‐randomization and at 4 and 12 weeks postpartum
2. Breastfeeding exclusivity	*Labbok & Krasovec's levels of breastfeeding	Baseline, 4 and 7 days post‐randomization and at 4 and 12 weeks postpartum
Other outcomes
1. Pain intensity	11‐point NRS	7 days post‐randomization
2. Pain quality	SF‐MPQ	4 days post‐randomization
3. Breastfeeding self‐efficacy	BSES‐SF	4 days post‐randomization
4. Maternal satisfaction with intervention	Maternal satisfaction questionnaire	12 weeks postpartum

^* (Labbok & Krasovec, 1990).

NRS, Numeric Rating Scale; SF‐MPQ, Short‐Form McGill Pain Questionnaire; BSES‐SF, Breastfeeding Self‐Efficacy Scale Short‐Form.