Table 1. Descriptive Characteristics of the Behavior Study Sample in the Study Population.
| Characteristic | Behavior Study Sample, No. (%) |
|---|---|
| No. of participants | 4471 |
| Sociodemographic Characteristics | |
| Age, median (IQR), y | 9.7 (9.6-9.9) |
| Sex | |
| Male | 2200 (49.2) |
| Female | 2271 (50.8) |
| Ethnicity | |
| Western | 3280 (73.4) |
| Non-Western | 1142 (25.5) |
| Missing | 49 (1.1) |
| Gestational age at birth, mean (SD), wka | 39.8 (1.9) |
| Birth weight, mean (SD), g | 3417.0 (577.6) |
| Maternal educational level | |
| None or primary education only | 84 (1.9) |
| Secondary education | 1455 (32.5) |
| Higher education | 2535 (56.7) |
| Missing | 397 (8.9) |
| Household income, tertile | |
| Lowest | 953 (21.3) |
| Middle | 1465 (32.8) |
| Highest | 1460 (32.7) |
| Missing | 593 (13.3) |
| Hearing Acuity | |
| Better-hearing ear, mean (SD), dB HL | |
| LPTA | 6.5 (4.7) |
| HPTA | 6.6 (4.9) |
| Worse-hearing ear, mean (SD), dB HL | |
| LPTA | 9.2 (5.9) |
| HPTA | 9.8 (6.3) |
| SRT, mean (SD), dB SNR | 5.7 (1.5) |
Abbreviations: HL, hearing level; HPTA, high-frequency pure-tone average; IQR, interquartile range; LPTA, low-frequency pure-tone average; SNR, signal-to-noise ratio; SRT, speech reception threshold.
a
There were 270 children (6.1%) with preterm birth (gestational age <37 wk).