Table 2.
Summary of observed and expected recordings performed according to gestational age and postnatal age
| GA (wks) |
<72 hours | 72–168 hours |
Wk 2 | Wk3 | Wk4 | Wk5 | Wk6 | Wk7 | Wk8 | Wk9 | Wk10 | Wk11 | Wk12 | Wk13 | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 23 | 0/1 (0%) | 0/1 (0%) | 0/1 (0%) | 0/1 (0%) | 0/1 (0%) | 1/1 (100%) | 0/1 (0%) | 0/1 (0%) | 1/1 (100%) | 1/1 (100%) | 1/1 (100%) | 1/1 (100%) | 1/1 (100%) | 1/1 (100%) | 7/14 (50%) |
| 24 | 7/11 (64%) | 10/11 (91%) | 6/11 (55%) | 6/11 (55%) | 7/10 (70%) | 7/10 (70%) | 6/9 (67%) | 8/9 (89%) | 7/9 (78%) | 7/9 (78%) | 8/9 (89%) | 5/9 (56%) | 8/9 (89%) | 92/127 (72%) | |
| 25 | 13/16 (81%) | 14/15 (93%) | 11/14 (79%) | 13/14 (93%) | 11/13 (85%) | 13/13 (100%) | 12/13 (92%) | 11/13 (85%) | 11/11 (100%) | 8/10 (80%) | 10/10 (100%) | 10/10 (100%) | 137/152 (90%) | ||
| 26 | 11/18 (61%) | 13/17 (76%) | 13/17 (76%) | 13/15 (87%) | 15/15 (100%) | 13/13 (100%) | 10/13 (77%) | 11/11 (100%) | 9/10 (90%) | 10/10 (100%) | 8/9 (89%) | 126/148 (85%) | |||
| 27 | 20/23 (87%) | 23/23 (100%) | 19/22 (86%) | 18/22 (82%) | 21/22 (95%) | 20/22 (91%) | 16/21 (76%) | 16/21 (76%) | 16/19 (84%) | 11/17 (65%) | 180/212 (85%) | ||||
| 28 | 20/28 (71%) | 22/28 (79%) | 25/27 (93%) | 23/25 (92%) | 20/23 (87%) | 20/23 (87%) | 19/22 (86%) | 19/22 (86%) | 13/20 (65%) | 181/218 (83%) | |||||
| 29+ | 4/5 (80%) | 4/5 (80%) | 4/5 (80%) | 3/5 (60%) | 5/5 (100%) | 5/5 (80%) | 4/4 (100%) | 3/3 (100%) | 32/37 (86%) | ||||||
| Total | 75/102 (74%) | 86/100 (86%) | 78/97 (80%) | 76/93 (82%) | 79/89 (89%) | 79/87 (91%) | 67/83 (81%) | 68/80 (85%) | 57/70 (81%) | 37/47 (79%) | 27/29 (93%) | 16/20 80%) | 9/10 (90%) | 1/1 (100%) | 755/908 (83%) |
Expected number of recordings was calculated using the assumption of 2 recordings in the first week and 1 recording each week thereafter until 36 weeks PMA. As the protocol allowed 4 – 10 days between weekly recordings, this estimate may not be in agreement with the reported protocol deviations.