Table 1.

Blinding of information at each step of classification

Step no.	Collective name for data	Available case information to Analysis Team
1	‘Case’
2	‘Pair’	Pairwise: dreamful vs. dreamless, same participant.
3	‘Participant-group’	Pairwise: dreamful vs. dreamless, same participant.	Groups of six cases: same participant.
4	‘Participant-condition group’	Pairwise: dreamful vs. dreamless, same participant.	Groups of six cases: same participant.	Groups of three cases: same dreamfulness, same participant.
5	‘Condition group’	Pairwise: dreamful vs. dreamless, same participant.	Groups of six cases: same participant.	Groups of three cases: same dreamfulness, same participant.	All dreamful vs. all dreamless.