Table. Measures of Central Tendency and Dispersion of Confounding Variables in the Groups Exposed and Unexposed to the Oral Polio Vaccine, Stratified by Residence Place.
| Variable | Exposed (n = 419) | Unexposed (n = 3771) | P valuea | |||
|---|---|---|---|---|---|---|
| Ahwaz (n = 244) | Shiraz (n = 175) | Ahwaz (n = 2196) | Shiraz (n = 1575) | |||
| Participant’s age, y | ||||||
| Mean (SD) | 36.0 (5.0) | 34.8 (4.8) | 35.6 (5.6) | 36.0 (4.7) | .31 | |
| Median (IQR) | 36.0 (33.0-39.0) | 35.0 (31.0-38.0) | 35.0 (32.0-39.0) | 36.0 (33.0-39.0) | ||
| Range | 24.0-48.0 | 21.0-46.0 | 19.0-48.0 | 21.0-48.0 | ||
| Mean age of household members, y | ||||||
| Mean (SD) | 27.3 (5.8) | 26.8 (6.2) | 27.3 (5.7) | 28.0 (5.3) | .09 | |
| Median (IQR) | 26.0 (23.5-30.0) | 26.0 (22.1-31.0) | 26.5 (23.2-30.7) | 27.3 (24.3-31.3) | ||
| Range | 16.2-47.5 | 12.0-46.0 | 13.3-55.3 | 13.0-57.2 | ||
| No. of household members | ||||||
| Mean (SD) | 3.8 (1.4) | 3.2 (1.0) | 3.6 (1.2) | 3.2 (0.9) | .20 | |
| Median (IQR) | 3.0 (3.0-4.0) | 3.0 (3.0-4.0) | 3.0 (3.0-4.0) | 3.0 (3.0-4.0) | ||
| Range | 2.0-11.0 | 1.0-6.0 | 1.0-13.0 | 1.0-9.0 | ||
| No. of children | ||||||
| Mean (SD) | 1.6 (1.2) | 1.2 (0.9) | 1.5 (1.1) | 1.2 (0.8) | .31 | |
| Median (IQR) | 1.0 (1.0-2.0) | 1.0 (1.0-2.0) | 1.0 (1.0-2.0) | 1.0 (1.0-2.0) | ||
| Range | 0.0-7.0 | 0.0-4.0 | 0.0-10.0 | 0.0-3.0 | ||
a
Welch t test for independent samples comparing means of the exposed and unexposed groups.