Numbers of x rays and absorbed doses received by preterm babies in relation to postnatal age
| Postnatal age (weeks) | ||||
|---|---|---|---|---|
| 2 | 4 | 6 | 8 | |
| Number of babies | 42 | 30 | 17 | 5 |
| Number of x rays—range | 1–19 | 4–27 | 4–31 | 8–43 |
| Number of x rays—mean | 6.9 | 11.2 | 16.5 | 26.8 |
| Total number of x rays | 292 | 338 | 280 | 134 |
| Mean absorbed dose (mJ/kg)—range | 0.002–0.13 | 0.017–0.21 | 0.02–0.24 | 0.07–0.32 |
| Mean absorbed dose (mJ/kg)—mean | 0.072 | 0.087 | 0.130 | 0.188 |