Table 2.

Percentages of missing data by task.

	T1% missing				T2% missinga
	Sample	Probiotic	Placebo	DAU		Sample	Probiotic	Placebo	DAU
Paper tasks
Cancellationb	0	0	0	0		6.78	12.16	5.06	4.08
Numeracy	n.a	n.a	n.a	n.a		2.39	0	2.53	4.08
Computer tasksc
Flanker	67.33	63.51	73.42	64.29		54.98	55.41	63.29	47.96
Set shifting	73.31	71.62	81.01	68.37		60.16	56.76	70.89	54.08
Go/no-go	56.57	60.81	68.35	43.88		44.22	40.54	58.23	35.71

DAU Diet as usual, n.a. not administered.

^a6 lost to follow-up; ^b11 lost due to procedure change; ^cprimary reason for missing response is failure to pass practice rounds of test (< 0.5% of responses lost due to computer error).