Table A-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, Survivors Only.
| 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 | 7.9 8 (−21, 37) |
20 19 (−8, 46) |
29.6 31 (1, 56) |
41.1 40.5 (13, 66) |
51.8 51 (27, 76) |
60.8 60 (36, 83) |
71.1 70 (47, 92) |
81.3 80 (58, 100) |
90.3 88 (68, 108) |
102.3 100 (81, 117) |
105 102 (86, 117) |
106.4 102 (88, 118) |
107.1 102 (88, 118) |
| 25 | 12.1 11 (−17, 39) |
21.7 23 (−8, 49) |
33.2 32.5 (4, 59) |
43.9 43 (18, 69) |
52.9 52 (27, 76) |
63.2 62 (38, 85) |
73.4 72 (49, 93) |
82.4 80 (59, 101) |
94.4 92 (72, 110) |
97.1 94 (77, 110) |
98.5 94 (79, 111) |
99.2 94 (79, 111) |
|
| 26 | 9.6 12 (−17, 36) |
21 21.5 (−5, 46) |
31.7 32 (9, 56) |
40.8 41 (18, 63) |
51.1 51 (29, 72) |
61.3 61 (40, 80) |
70.3 69 (50, 88) |
82.2 81 (63, 97) |
84.9 83 (68, 97) |
86.3 83 (70, 98) |
87.1 83 (70, 98) |
||
| 27 | 11.5 9.5 (−15, 37) |
22.2 20 (−1, 47) |
31.2 29 (8, 54) |
41.6 39 (19, 63) |
51.7 49 (30, 71) |
60.7 57 (40, 79) |
72.7 69 (53, 88) |
75.4 71 (58, 88) |
76.8 71 (60, 89) |
77.5 71 (60, 89) |
|||
| 28 | 10.7 10.5 (−11, 35) |
19.8 19.5 (−2, 42) |
30.1 29.5 (9, 51) |
40.2 39.5 (20, 59) |
49.2 47.5 (30, 67) |
61.2 59.5 (43, 76) |
63.9 61.5 (48, 76) |
65.3 61.5 (50, 77) |
66 61.5 (50, 77) |
||||
| 29 | 9.1 9 (−12, 28) |
19.4 19 (−1, 37) |
29.5 29 (10, 45) |
38.5 37 (20, 53) |
50.5 49 (33, 62) |
53.2 51 (38, 62) |
54.6 51 (40, 63) |
55.3 51 (40, 63) |
|||||
| 30 | 10.3 10 (−8, 28) |
20.5 20 (3, 36) |
29.5 28 (13, 44) |
41.4 40 (26, 53) |
44.1 42 (31, 53) |
45.5 42 (33, 54) |
46.3 42 (33, 54) |
||||||
| 31 | 10.2 10 (−6, 25) |
19.1 18 (4, 33) |
31.1 30 (17, 42) |
33.8 32 (22, 42) |
35.2 32 (24, 43) |
35.9 32 (24, 43) |
|||||||
| 32 | 9 8 (−4, 22) |
21 20 (9, 31) |
23.7 22 (14, 31) |
25.1 22 (16, 32) |
25.8 22 (16, 32) |
||||||||
| 33 | 12 12 (1, 21) |
14.7 14 (6, 21) |
16.1 14 (8, 22) |
16.8 14 (8, 22) |
|||||||||
| 34 | 2.7 2 (−3, 8) |
4.1 2 (−1, 9) |
4.8 2 (−1, 9) |
Infants with a birth weight <500g and infants with a gestational age that was inconsistent with birth weight were deleted.