One-way analysis of variance of age and duration of symptoms among 4 groups of coccyx morphologies.
| Source of Variation | Sum of Squares | df | Mean Square | F | P value |
| Age | |||||
| Between groups | 1816.248 | 3 | 605.416 | 3.285 | 0.024 |
| Within groups | 19533.242 | 106 | 184.276 | ||
| Total | 21349.491 | 109 | |||
| Duration of symptoms | |||||
| Between groups | 44.599 | 3 | 14.866 | 0.295 | 0.829 |
| Within groups | 5339.469 | 106 | 50.372 | ||
| Total | 5384.068 | 109 |