Table 4.
Comparison of BC Nonparticipants and Participants by Type of Nonparticipant, Children's Oncology Group, 1995–2006
| Variable | Participants (n = 63) |
Nonparticipants |
Overall P Value | ||||
| Refusal (n = 73) |
Not Found (n = 115) |
||||||
| No. | % | No. | % | No. | % | ||
| Sex | 0.36 | ||||||
| Male | 33 | 53.2 | 38 | 54.3 | 50 | 44.6 | |
| Female | 29 | 46.8 | 32 | 45.7 | 62 | 55.4 | |
| Missing | 1 | 3 | 3 | ||||
| Maternal education, years | <0.001 | ||||||
| 0–8 | 0 | 0.0 | 0 | 0.0 | 9 | 10.8a | |
| 9–11 | 2 | 3.8 | 2 | 4.0 | 21 | 25.3 | |
| 12 | 17 | 32.7 | 16 | 32.0 | 25 | 30.1 | |
| 13–15 | 13 | 25.0 | 18 | 36.0 | 19 | 22.9 | |
| ≥16 | 20 | 38.5 | 14 | 28.0 | 9 | 10.8 | |
| Missing | 11 |
23 |
32 |
||||
| No. |
Mean (SD) |
No. |
Mean (SD) |
No. |
Mean (SD) |
||
| Maternal age, years | 63 | 28.7 (5.0) | 73 | 28.2 (6.1) | 115 | 25.7a (6.2) | 0.001 |
| Birth weight, g | 63 | 3,436.8 (565.1) | 72 | 3,299.3 (568.5) | 115 | 3,256.9 (672.2) | 0.18 |
Abbreviations: BC, birth certificate; SD, standard deviation.
a
Significantly different from participants (P < 0.01).