TABLE 2.

Weight z score and z score deviation by age group: CIGS data¹

	n	Age, wk	Weight z score	Time interval, wk	Weight z score deviation
Age group
0 wk	269	0.0 ± 0.0	0.1 ± 1.0	—	—
4 wk	253	4.0 ± 0.3	−0.2 ± 0.9	—	—
8 wk	254	8.1 ± 0.2	−0.2 ± 0.9	—	—
12 wk	255	12.0 ± 0.2	−0.3 ± 0.9	—	—
16 wk	253	16.0 ± 0.3	−0.2 ± 0.9	—	—
20 wk	251	20.0 ± 0.3	−0.1 ± 0.9	—	—
24 wk	251	24.0 ± 0.3	0.0 ± 0.9	—	—
28 wk	247	28.1 ± 0.3	0.0 ± 0.9	—	—
32 wk	251	32.1 ± 0.3	0.1 ± 0.9	—	—
36 wk	250	36.0 ± 0.3	0.1 ± 0.9	—	—
40 wk	247	40.0 ± 0.3	0.2 ± 0.9	—	—
44 wk	245	44.0 ± 0.3	0.2 ± 0.9	—	—
48 wk	246	48.1 ± 0.4	0.2 ± 0.9	—	—
52 wk	247	52.1 ± 0.4	0.2 ± 0.9	—	—
15 mo	183	65.4 ± 0.8	0.3 ± 0.9	—	—
18 mo	240	78.2 ± 1.2	0.2 ± 0.9	—	—
24 mo	239	105 ± 1.5	0.1 ± 0.9	—	—
30 mo	187	131 ± 2.2	0.1 ± 0.9	—	—
3 y	187	158 ± 1.9	0.0 ± 0.9	—	—
4 y	117	210 ± 2.5	−0.1 ± 0.9	—	—
5 y	115	262 ± 1.6	−0.1 ± 0.9	—	—
6 y	52	314 ± 1.1	0.0 ± 0.9	—	—
Age interval  group
0–4 wk	253	—	—	4.0 ± 0.3	−0.3 ± 0.6
4–8 wk	252	—	—	4.0 ± 0.3	−0.1 ± 0.4
8–12 wk	254	—	—	4.0 ± 0.3	0.0 ± 0.3
12–16 wk	253	—	—	4.0 ± 0.3	0.1 ± 0.3
16–20 wk	251	—	—	4.0 ± 0.4	0.1 ± 0.3
20–24 wk	250	—	—	4.0 ± 0.4	0.1 ± 0.2
24–28 wk	246	—	—	4.0 ± 0.4	0.0 ± 0.2
28–32 wk	247	—	—	4.0 ± 0.4	0.1 ± 0.2
32–36 wk	250	—	—	4.0 ± 0.3	0.0 ± 0.2
36–40 wk	247	—	—	4.0 ± 0.4	0.1 ± 0.2
40–44 wk	245	—	—	4.0 ± 0.4	0.0 ± 0.2
44–48 wk	243	—	—	4.0 ± 0.4	0.0 ± 0.2
48–52 wk	246	—	—	4.0 ± 0.5	0.0 ± 0.2
52 wk–15 mo	182	—	—	13.3 ± 0.8	0.0 ± 0.3
15–18 mo	180	—	—	13.0 ± 1.2	0.0 ± 0.3
18–24 mo	238	—	—	26.6 ± 1.7	−0.1 ± 0.3
24–30 mo	187	—	—	26.3 ± 2.4	−0.1 ± 0.3
30 mo–3 y	185	—	—	26.3 ± 2.4	0.0 ± 0.3
3–4 y	117	—	—	52.1 ± 2.9	0.0 ± 0.3
4–5 y	112	—	—	52.3 ± 3.2	0.0 ± 0.3
5–6 y	52	—	—	51.6 ± 2.0	0.0 ± 0.2

¹Values are means ± SDs unless otherwise indicated. CIGS, Cambridge Infant Growth Study.