Table 3.

Summary of scales included in the questionnaire to measure confidence and knowledge

Measure	Description	Items	Reliabilitya	Range	Q1 Mdn (IQR)	Q3 Mdn (IQR)	Outcome
Self-perceived confidence scale	Clinical scenario given. Confidence felt in discussing features of NIPT.	13 items, 4 point Likert scales	0.95	0 – 39	7 (9)	23 (3)	Statistically significant improvement in self-perceived confidence p < 0.001
Self-perceived knowledge scale	Self-perceived knowledge regarding features of NIPT	6 items, 4 point Likert scales	0.92	0 – 18	1 (3)	8 (4)	Statistically significant improvement in self-perceived knowledge p < 0.001
Knowledge Test	Knowledge of cffDNA, features of NIPT, care pathway for NIPT	8 items, True, false, unsure	0.81	0 – 8	2 (4)	6 (2)	Statistically significant improvement in knowledge test p < 0.001

^aReliability was assessed using Cronbach’s alpha for Likert scales and Kuder-Richardson 20 Formula for dichotomous questions