Table 4.
Estimates of the Reduction in Length of Stay Associated with 1 Week Increases in Gestational Age: Mean, Median, and Ranges. Estimated From 1998–2000 California Data.
| Gestational Age (completed weeks) | To 25 Weeks (days) | To 26 Weeks (days) | To 27 Weeks (days) | To 28 Weeks (days) | To 29 Weeks (days) | To 30 Weeks (days) | To 31 Weeks (days) | To 32 Weeks (days) | To 33 Weeks (days) | To 34 Weeks (days) | To 35 Weeks (days) | To 36 Weeks (days) | To 37 Weeks (days) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 24 | −4.4 3 (−89, 44) |
−3 9.5 (−80, 44) |
4.2 20 (−70, 53) |
12.9 30 (−59, 60) |
22.4 40 (−46, 70) |
31.1 49 (−37, 77) |
40.5 58 (−26, 85) |
50.7 68 (−15, 93) |
59.6 76 (−5, 101) |
71.5 88 (8, 110) |
74.2 90 (13, 110) |
75.6 90 (15, 111) |
76.4 90 (15, 111) |
| 25 | 1.3 6.5 (−30, 39) |
8.6 17 (−20, 48) |
17.2 27 (−9, 55) |
26.8 37 (4, 65) |
35.4 46 (13, 72) |
44.8 55 (24, 80) |
55.1 65 (35, 88) |
64 73 (45, 96) |
75.8 85 (58, 105) |
78.6 87 (63, 105) |
80 87 (65, 106) |
80.7 87 (65, 106) |
|
| 26 | 7.2 10.5 (−20, 39) |
15.9 20.5 (−9, 46) |
25.5 30.5 (4, 56) |
34.1 39.5 (13, 63) |
43.5 48.5 (24, 71) |
53.8 58.5 (35, 79) |
62.7 66.5 (45, 87) |
74.5 78.5 (58, 96) |
77.2 80.5 (63, 96) |
78.7 80.5 (65, 97) |
79.4 80.5 (65, 97) |
||
| 27 | 8.7 10 (−18, 36) |
18.2 20 (−5, 46) |
26.9 29 (4, 53) |
36.3 38 (15, 61) |
46.5 48 (26, 69) |
55.4 56 (36, 77) |
67.3 68 (49, 86) |
70 70 (54, 86) |
71.4 70 (56, 87) |
72.2 70 (56, 87) |
|||
| 28 | 9.5 10 (−12, 35) |
18.2 19 (−3, 42) |
27.6 28 (8, 50) |
37.8 38 (19, 58) |
46.7 46 (29, 66) |
58.6 58 (42, 75) |
61.3 60 (47, 75) |
62.8 60 (49, 76) |
63.5 60 (49, 76) |
||||
| 29 | 8.7 9 (−13, 29) |
18 18 (−2, 37) |
28.3 28 (9, 45) |
37.2 36 (19, 53) |
49.1 48 (32, 62) |
51.8 50 (37, 62) |
53.2 50 (39, 63) |
53.9 50 (39, 63) |
|||||
| 30 | 9.4 9 (−9, 28) |
19.6 19 (2, 36) |
28.5 27 (12, 44) |
40.4 39 (25, 53) |
43.1 41 (30, 53) |
44.6 41 (32, 54) |
45.3 41 (32, 54) |
||||||
| 31 | 10.3 10 (−6, 25) |
19.1 18 (4, 33) |
31 30 (17, 42) |
33.7 32 (22, 42) |
35.2 32 (24, 43) |
35.9 32 (24, 43) |
|||||||
| 32 | 8.9 8 (−4, 22) |
20.8 20 (9, 31) |
23.5 22 (14, 31) |
24.9 22 (16, 32) |
25.6 22 (16, 32) |
||||||||
| 33 | 11.9 12 (1, 21) |
14.6 14 (6, 21) |
16 14 (8, 22) |
16.7 14 (8, 22) |
|||||||||
| 34 | 2.7 2 (−3, 8) |
4.2 2 (−1, 9) |
4.9 2 (−1, 9) |
Infants with a birth weight <500g and infants with a gestational age that was inconsistent with birth weight were deleted.