Table 1.

Participant numbers over time.

	Test 1 (baseline)	Test 2 (same day)	Test 3 (6 months later)	Test 4 (1 year later)
Age groups at start	124 children (N, mean, range and SD)	121 children	101 children	105 children
3 years	N = 44 (17 females, 27 males, mean age = 3.4, age range; 2.8–3.9, SD = .3)	N = 42, (17 females, 25 males, mean age = 3.4, age range; 2.8–3.9, SD = .3)	N = 31 (12 females, 19 males, mean age = 3.9, age range; 3.4–3.9, SD = .4)	N = 34, (15 females, 19 males, mean age = 4.5, age range; 4.0–5.1, SD = .3)
4 years	N = 31 (15 females, 16 males, mean age = 4.6, age range; 4.0–4.9, SD = .2)	N = 30 (14 females, 16 males, mean age = 4.6, age range; 4.0–4.9, SD = .2)	N = 29 (14 females, 15 males, mean age = 5.0, age range; 4.4–5.4, SD = .2)	N = 24 (11 females, 13 males, mean age = 5.6, age range; 5.2–5.9, SD = .2)
5 years	N = 49 (23 females, 26 males, mean age = 5.7, age range; 5.0–6.8, SD = .4)	Same as at Test 1	N = 61 (18 females, 23 males, mean age = 6.2, age range; 5.5–7.3, SD = .5)	N = 47 (22 females, 25 males, mean age = 6.0, age range; 5.8–7.8, SD = .5)
Adults	40 parents (8 males, 32 females, mean age = 38.9 years; SD = 4.9)	n/a	n/a	n/a