Table 4.
Non response analysis (n = 7393)
| Characteristics | Included n= 3774 | Excluded n=3619 | p value* | |
|---|---|---|---|---|
| Sex | ||||
| Boys (%1) | 1873 (49.6) | 1834 (50.7) | ||
| Girls (%1) | 1901 (50.4) | 1785 (49.3) | 0.374 | |
| Missing (%2) | 0 (0.0) | 0(0.0) | ||
| Age in years | ||||
| Median (range) | 9.78 (9.49 - 10.45) | 9.86 (9.56 - 11.12) | < 0.001 | |
| Missing (%2) | 0 (0.0) | 3252(89.9) | ||
| Ethnicity (%) | ||||
| Dutch (%1) | 2573 (68.6) | 1619 (47.7) | ||
| Other western (%1) | 327 (8.7) | 247 (7.3) | ||
| Non-western (%1) | 851 (22.7) | 1529 (45.0) | < 0.001 | |
| Missing (%2) | 23 (0.6) | 379(10.5) | ||
| Maternal education level | ||||
| Low (%1) | 1234 (34.9) | 1191 (52.1) | ||
| High (%1) | 2301 (65.1) | 1093 (47.9) | < 0.001 | |
| Missing (%2) | 239 (6.3) | 1490(41.2) | ||
| Household income (%) | ||||
| < 2000 (%1) | 619 (17.6) | 358 (31.8) | ||
| 2000-3200 (%1) | 1087 (30.9) | 353 (31.3) | ||
| > 3200 (%1) | 1813 (51.5) | 415 (36.9) | < 0.001 | |
| Missing (%2) | 255(6.8) | 2493(68.9) | ||
| IOTN-DHC (%) | ||||
| 2 (%1) | 1119 (37.2) | 632 (37.7) | ||
| 3 (%1) | 756 (25.1) | 380 (22.7) | ||
| 4 (%1) | 871 (28.9) | 496 (29.6) | ||
| 5 (%1) | 263 (8.7) | 168 (10.0) | 0.185 | |
| Missing (%2) | 765(20.3) | 1943(53.7) | ||
| IOTN-ac (%) | ||||
| ≤ 5 (%1) | 2063 (70.9) | 1144 (70.8) | ||
| > 5 (%1) | 845 (29.1) | 471 (29.2) | 0.940 | |
| Missing (%2) | 866(22.9) | 2034(56.2) | ||
| OHRQoL | ||||
| Median (range) | 50.0 (43.0 - 53.0) | 49.0 (44.3 - 54.9) | ||
| Missing (%2) | 0(0.0) | 3597(99.4) | 0.959 | |
| Subjective treatment-need (%) | ||||
| No (%1) | 1049 (27.8) | 1 (11.1) | ||
| Borderline (%1) | 958 (25.4) | 2 (22.2) | ||
| Yes (%1) | 1767 (46.8) | 6 (66.7) | 0.429 | |
| Missing (%2) | 0(0.0) | 3610 | ||
*
Based on chi square test for categorical variables and t-test or Mann –Whitney U for continuous variables.
1
percentage of available data within the subgroup;
2
percentage of missing data per subgroup