Table 2 Sample characteristics by mortality status at end of follow-up on 31st December 2013, ONS Longitudinal Study
|  | TOTAL (n = 353,601) | Dead (n = 8814) | Alive (n = 344,787) | p-value (difference by death status) |
|---|---|---|---|---|
1st observation (baseline) | ||||
Median age (SIQR) | 353,601 | 9.0 (10.0) | 7.0 (6.5) | 0.0001 |
Gender (%) |  |  |  | < 0.0005 |
 Male | 180,905 | 5607 (3.10) | 175,298 (96.90) |  |
 Female | 172,696 | 3207 (1.86) | 169,489 (98.14) |  |
Country of birth (%) |  |  |  | < 0.0005 |
 UK | 338,661 | 8514 (2.51) | 330,147 (97.49) |  |
 Other | 14,940 | 300 (2.01) | 14,640 (97.99) |  |
Census year (%) |  |  |  | < 0.0005 |
 1971 | 135,810 | 6631 (4.88) | 129,179 (95.12) |  |
 1981 | 73,667 | 1428 (1.94) | 72,239 (98.06) |  |
 1991 | 74,440 | 583 (0.78) | 73,857 (99.22) |  |
 2001 | 69,684 | 172 (0.25) | 69,512 (99.75) |  |
In Care (%) |  |  |  | < 0.0005 |
 Yes | 5681 | 227 (4.00) | 5454 (97.53) |  |
 No | 347,920 | 8587 (2.47) | 339,333 (96.00) |  |
2nd observation | ||||
In Care (%) |  |  |  | < 0.0005 |
 Yes | 2242 | 69 (3.08) | 2173 (96.92) |  |
 No | 135,696 | 2421 (1.78) | 133,275 (98.22) |  |
Follow-up | ||||
 Median age of death or censoring (SIQR) | 353,801 | 40.0 (37.5) | 38.0 (37.5) | 0.023 |