Table 1. Baseline Characteristics of Cohorts Before and After Propensity Score Matchinga.
| Characteristic | Before Matching | After Matching | ||||
|---|---|---|---|---|---|---|
| TEES (n = 65) | PA (n = 112) | Standardized Difference | TEES (n = 64) | PA (n = 64) | Standardized Difference | |
| Age, mean (SD), y | 9.9 (3.6) | 9.9 (3.5) | 0.01 | 9.9 (3.6) | 9.3 (3.7) | 0.16 |
| Female | 33 (50.8) | 40 (35.7) | 0.30 | 32 (50.0) | 26 (40.6) | 0.19 |
| Cleft palate | 6 (9.2) | 16 (14.3) | 0.15 | 6 (9.4) | 6 (9.4) | 0.00 |
| Missing | 0 | 2 (1.8) | ||||
| Syndromic | 2 (3.1) | 14 (12.5) | 0.34 | 2 (3.1) | 1 (1.6) | −0.06 |
| Missing | 0 | 2 (1.8) | ||||
| Etiology | ||||||
| Congenital | 17 (26.2) | 23 (20.5) | −0.12 | 17 (26.6) | 19 (29.7) | 0.07 |
| Canal | 0 | 4 (3.6) | 0 | 0 | ||
| Flaccida | 6 (9.2) | 7 (6.3) | −0.10 | 6 (9.4) | 6 (9.4) | 0.00 |
| Tensa | 33 (50.8) | 70 (62.5) | 0.21 | 33 (51.6) | 33 (51.6) | 0.00 |
| Flaccida and tensa | 4 (6.2) | 4 (3.6) | −0.05 | 3 (4.7) | 2 (3.1) | −0.08 |
| Secondary acquired | 5 (7.7) | 4 (3.6) | −0.17 | 5 (7.5) | 4 (6.3) | −0.07 |
| Saleh and Mills S stageb | ||||||
| S1 | 35 (53.9) | 61 (54.5) | −0.01 | 35 (54.7) | 34 (53.1) | −0.03 |
| S2 or S3 | 30 (46.2) | 45 (40.2) | −0.08 | 29 (45.3) | 26 (40.6) | −0.09 |
| Missing | 0 | 6 (5.4) | ||||
| Saleh and Mills O stagec | ||||||
| O0 | 28 (43.1) | 40 (35.7) | −0.15 | 28 (43.8) | 27 (42.2) | −0.03 |
| O1 | 17 (26.2) | 31 (27.7) | 0.07 | 16 (25.0) | 18 (28.1) | 0.07 |
| O2 or O3 | 20 (30.8) | 39 (34.8) | 0.09 | 20 (31.3) | 19 (29.7) | −0.03 |
| Missing | 0 | 2 (1.8) | ||||
| Otorrhea at surgery | 3 (4.6) | 18 (15.2) | 0.35 | 3 (4.7) | 2 (3.1) | −0.05 |
| Missing | 0 | 1 (0.9) | ||||
| Perforation at surgery | 26 (40.0) | 49 (43.8) | 0.09 | 26 (40.6) | 27 (42.2) | 0.03 |
| Missing | 1 (1.5) | 1 (0.9) | ||||
Abbreviations: Missing, cases with data missing; PA, postauricular approach with operative microscope; TEES, transcanal endoscopic ear surgery.
a
Data are presented as number (percentage) unless otherwise indicated.
b
Saleh and Mills8 S stage indicates the number of sites affected by cholesteatoma: S1 indicates a single disease site; S2, 2 sites; and S3, 3 sites.
c
Saleh and Mills8 O stage indicates the presence and extent of ossicular involvement: O0 indicates intact ossicles; O1, incus erosion and ossicular discontinuity; O2, incus and stapes arch erosion; and O3, absent malleus hand and incus and stapes arch erosion.