From: Statistics review 9: One-way analysis of variance
Age group
1–4 months
5–8 months
9–12 months
24.4
25.8
26.1
23.0
25.6
27.7
25.4
28.2
21.8
24.8
22.6
23.9
23.6
22.0
25.0
23.8
23.4
27.3
26.0
22.5
22.8
27.4
21.7
26.6
26.2