Totalled events observed and their ratings, and interruption duration associated with each source category
| Source | Tally of events (a) | Tally of event ratings (b) | Ratio of a to b | Interruption duration |
|---|---|---|---|---|
| Conversation | 198 | 902 | 4.55 | 100.62 |
| Phone | 130 | 283 | 2.17 | 4.05 |
| Bleeper | 26 | 40 | 1.53 | 1.30 |
| Equipment | 58 | 376 | 6.48 | 35.48 |
| Procedure | 36 | 195 | 5.41 | 26.73 |
| Environment | 163 | 351 | 2.15 | 1.53 |
| Monitor | 3 | 10 | 3.33 | 0.13 |