TABLE 2.

Prevalence of challenging behaviour of each subtype at each time point

Category	Prevalence (%) [95% CI]
	Time 1	Time 2	Time 3	Time 4
Self‐Injurious behaviour	41.3 [34.7, 48.0]	37.3 [31.1, 43.6]	37.8 [31.6, 44.0]	37.3 [31.1, 43.6]
Aggressive‐destructive behaviour	33.3 [27.1, 39.6]	32.4 [26.7, 38.7]	39.1 [32.9, 45.3]	40.4 [33.8, 47.1]
Stereotyped behaviour	28.4 [22.7, 34.7]	34.7 [28.9, 40.9]	36.9 [30.7, 43.1]	42.2 [36.0, 48.9]
Overall challenging behaviour	58.2 [51.6, 64.9]	57.8 [51.6, 64.4]	61.3 [55.1, 67.6]	64.0 [57.8, 70.2]