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Percentage of selected fields which were blank in 7 000 patients' electronic medical record.
| Field | Mean % blank | Lower 95% CI | Upper 95% CI |
| Sex | 0 | 0 | 0 |
| Age | 0 | 0 | 0 |
| Marital status | 73 | 59 | 88 |
| Height | 100 | 99 | 100 |
| Weight | 99 | 97 | 100 |
| Job | 61 | 49 | 73 |
| Lifestyle information (smoking, alcohol etc) | 97 | 95 | 99 |
CI = Confidence interval
