APTDxTTD by gestational age							

weeks	-1.64SD	-1.5SD	-1.28SD	mean	+1.28SD	+1.5SD	+1.64SD
16.0	7.0	7.4	7.9	11.2	14.6	15.1	15.5
17.0	8.7	9.0	9.7	13.3	17.0	17.6	18.0
18.0	10.5	10.9	11.6	15.6	19.6	20.3	20.7
19.0	12.5	13.0	13.7	18.1	22.4	23.2	23.6
20.0	14.7	15.2	16.1	20.8	25.5	26.3	26.8
21.0	17.1	17.6	18.5	23.6	28.8	29.6	30.2
22.0	19.6	20.2	21.2	26.7	32.2	33.2	33.8
23.0	22.2	22.9	23.9	29.9	35.9	36.9	37.5
24.0	25.0	25.7	26.8	33.2	39.7	40.8	41.5
25.0	27.9	28.6	29.8	36.7	43.6	44.8	45.6
26.0	30.9	31.7	33.0	40.3	47.7	49.0	49.8
27.0	33.9	34.8	36.2	44.1	52.0	53.3	54.2
28.0	37.1	38.0	39.4	47.9	56.3	57.8	58.7
29.0	40.3	41.3	42.8	51.8	60.8	62.3	63.3
30.0	43.5	44.5	46.2	55.7	65.3	66.9	68.0
31.0	46.8	47.9	49.6	59.7	69.9	71.6	72.7
32.0	50.0	51.2	53.0	63.8	74.5	76.4	77.6
33.0	53.3	54.5	56.5	67.8	79.2	81.2	82.4
34.0	56.5	57.8	59.9	71.9	83.9	86.0	87.3
35.0	59.7	61.1	63.3	75.9	88.6	90.8	92.2
36.0	62.8	64.3	66.6	79.9	93.3	95.6	97.0
37.0	65.9	67.4	69.8	83.9	97.9	100.3	101.9
38.0	68.8	70.4	72.9	87.7	102.5	105.0	106.7
39.0	71.6	73.3	76.0	91.5	107.0	109.7	111.4
40.0	74.3	76.1	78.9	95.1	111.4	114.2	116.0
41.0	76.8	78.6	81.6	98.6	115.7	118.6	120.5
42.0	79.1	81.1	84.1	102.0	119.8	122.9	124.8