Table 4. Mean height (cm) and standard deviation (SD) of the new references for length/height of Dutch children with Down syndrome, arranged by age and sex.

	Boys		Girls
Age (weeks)	Mean	SD*	Mean	SD*
0	48.9	2.5	48.4	2.1
2	50.4	2.6	49.8	2.2
4	51.9	2.6	51.3	2.2
6	53.4	2.6	52.6	2.2
8	54.8	2.6	54.0	2.2
10	56.2	2.6	55.3	2.2
12	57.5	2.6	56.5	2.3
16	60.0	2.6	58.7	2.3
20	62.2	2.6	60.7	2.3
24	64.1	2.7	62.6	2.4
28	65.8	2.7	64.2	2.4
32	67.3	2.7	65.7	2.4
36	68.6	2.7	67.0	2.5
40	69.8	2.7	68.2	2.5
44	70.9	2.8	69.3	2.5
48	71.9	2.8	70.3	2.6
52	73.0	2.8	71.3	2.6
Age (years)
1.5	78.3	3.0	76.4	2.8
2.0	82.6	3.1	80.8	3.0
2.5	86.4	3.3	84.6	3.2
3.0	89.8	3.5	88.1	3.5
3.5	93.1	3.7	91.6	3.7
4.0	96.4	3.9	95.2	3.9
4.5	99.7	4.0	98.6	4.1
5.0	102.9	4.2	101.7	4.3
6.0	109.0	4.5	107.2	4.6
7.0	114.7	4.8	113.0	4.9
8.0	119.9	5.0	118.7	5.2
9.0	125.2	5.3	124.0	5.5
10.0	130.8	5.5	129.3	5.8
11.0	136.8	5.7	134.4	6.1
12.0	142.9	5.8	139.1	6.3
13.0	148.7	5.9	142.9	6.5
14.0	153.5	6.0	145.9	6.6
15.0	157.2	6.1	147.9	6.8
16.0	159.8	6.2	149.4	6.9
17.0	161.8	6.2	150.5	7.0
18.0	163.0	6.2	151.2	7.1
19.0	163.4	6.2	151.6	7.2
20.0	163.4	6.2	151.8	7.3
21.0	163.4	6.2	151.8	7.3

*Individual height SDS can be calculated by: SDS = (height (cm)−mean height (cm))/SD (cm).

Abbreviations: SD – standard deviation, SDS – standard deviation score.