Table 3.
Surgical variables for the study cohort: correlation of variables with reports of feedback
| Variable | Feedback at first switch-on, n | Total, n |
p value | Feedback at 12 months, n |
Total, n |
p value |
Counts for 66 ears | ||
|---|---|---|---|---|---|---|---|---|---|
| no | yes | no | yes | ||||||
| Microphone location (see Fig. 1) | <0.001 | 0.01 | |||||||
| A (mastoid tip) | 1 (10) | 9 (90) | 10 (16) | 4 (40) | 6 (60) | 10 (16) | 10 (15) | ||
| B (posterior inferior mastoid line) | 27 (69) | 12 (31) | 39 (63) | 32 (82) | 7 (18) | 39 (63) | 43 (65) | ||
| C (posterior mastoid) | 5 (71) | 2 (29) | 7 (11) | 7 (100) | 0 (0) | 7 (11) | 7 (11) | ||
| D (posterior, retro-auricular) | 6 (100) | 0 (0) | 6 (10) | 6 (100) | 0 (0) | 6 (10) | 6 (9) | ||
| E (posterior superior) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | ||
| Device brand | 0.106 | 0.717 | |||||||
| Otologics Carina | 28 (57) | 21 (43) | 49 (79) | 38 (78) | 11 (22) | 49 (79) | 53 (80) | ||
| Cochlear Carina | 11 (85) | 2 (15) | 13 (21) | 11 (85) | 2 (15) | 13 (21) | 13 (20) | ||
| Actuator location | 1 | 1 | |||||||
| Stapes head | 1 (100) | 0 (0) | 1 (2) | 1 (100) | 0 (0) | 1 (2) | 1 (2) | ||
| Round window | 1 (100) | 0 (0) | 1 (2) | 1 (100) | 0 (0) | 1 (2) | 1 (2) | ||
| Body of incus | 37 (62) | 23 (38) | 60 (97) | 47 (78) | 13 (22) | 60 (97) | 64 (97) | ||
| Coupling site preparation | 1 | 1 | |||||||
| Drill | 1 (100) | 0 (0) | 1 (2) | 1 (100) | 0 (0) | 1 (2) | 1 (2) | ||
| Laser | 1 (100) | 0 (0) | 1 (2) | 1 (100) | 0 (0) | 1 (2) | 1 (2) | ||
| None | 35 (60) | 23 (40) | 58 (97) | 45 (78) | 13 (22) | 58 (97) | 64 (97) | ||
| Microphone fixation | 0.473 | 0.37 | |||||||
| Screws | 17 (71) | 7 (29) | 24 (39) | 20 (83) | 4 (17) | 24 (39) | 28 (43) | ||
| Sutures | 4 (67) | 2 (33) | 6 (10) | 6 (100) | 0 (0) | 6 (10) | 6 (9) | ||
| Both | 16 (53) | 14 (47) | 30 (48) | 21 (70) | 9 (30) | 30 (48) | 30 (46) | ||
| None | 2 (100) | 0 (0) | 2 (3) | 2 (100) | 0 (0) | 2 (3) | 2 (3) | ||
| Actuator at first fitting | 0.148 | 0.574 | |||||||
| T2 | 34 (60) | 23 (40) | 57 (92) | 44 (77) | 13 (23) | 57 (92) | 61 (92) | ||
| T1 | 5 (100) | 0 (0) | 5 (8) | 5 (100) | 0 (0) | 5 (8) | 5 (8) | ||
| Actuator at follow-up | 1 | 1 | |||||||
| T2 | 39 (63) | 23 (37) | 62 (100) | 49 (79) | 13 (21) | 62 (100) | 66 (100) | ||
Figures in parentheses are percentages. p values of significance are italicised. T2, current transducer model; T1, predecessor transducer model.