Table 1 Selected descriptive variables from the baseline data to assess difference in sample characteristics at follow-up by response*
From: Role of foetal kidney size on kidney function in childhood: the born in bradford cohort renal study
| Â | Follow-up | Non-response to renal follow-up | ||
|---|---|---|---|---|
| Â | Blood or urine | Blood | Urine | |
| Â | n (%) | n (%) | n (%) | n (%) |
n | 630 | 447 | 433 | 1155 |
Mother’s ethnic group |  |  |  |  |
White | 271 (43.0) | 190 (42.5) | 185 (42.7) | 678 (58.7) |
South Asian | 332 (52.7) | 240 (53.7) | 228 (52.7) | 403 (34.9) |
Other | 27 (4.3) | 17 (3.8) | 20 (4.6) | 9 (0.8) |
Derived equivalized mother’s education |  |  |  |  |
None (< 5 GCSE or equivalent) | 122 (19.4) | 82 (18.3) | 78 (18.9) | 173 (15.0) |
School (≥ 5 GCSE or equivalent) | 182 (28.9) | 137 (30.7) | 118 (28.6) | 377 (32.7) |
Further and higher (A level or equivalent or higher) | 281 (44.6) | 197 (44.1) | 190 (46.0) | 522 (45.3) |
Other (Other, Overseas, Unknown) | 45 (7.1) | 31 (6.9) | 27 (6.5) | 80 (6.9) |
Gender | Â | Â | Â | Â |
Male | 331 (52.5) | 224 (50.1) | 234 (54.0) | 555 (48.1) |
Female | 299 (47.5) | 223 (49.9) | 199 (46.0) | 600 (52.0) |
Birthweight (mean ± SD) | 3323 ± 483 | 3320 ± 464 | 3330 ± 492 | 3331 ± 501 |
Renal volume (cm3) | 9.67 ± 2.83 | 9.62 ± 2.82 | 9.65 ± 2.86 | 9.75 ± 2.77 |
Age at renal measurement, years | 8.8 ± 0.9 | 8.9 ± 0.9 | 8.8 ± 0.9 | - |