Trial Number | Volunteer 1 | Volunteer 2 | Volunteer 3 | Total mean |
---|---|---|---|---|
Allow simultaneous operation | ||||
 1 | 285 | 223 | 204 | 237 |
 2 | 263 | 187 | 197 | 216 |
 3 | 198 | 185 | 191 | 191 |
 Mean | 249 | 198 | 197 | 215 |
 SD | 37 | 17 | 5 | 19 |
Forbid simultaneous operation | ||||
 1 | 330 | 287 | 295 | 304 |
 2 | 308 | 289 | 271 | 289 |
 3 | 286 | 254 | 289 | 276 |
 Mean | 308 | 277 | 285 | 290 |
 SD | 18 | 16 | 10 | 11 |