Table 1.
Characteristics of the studies included in the analysis.
| Author | Country | Study design | Autism (n) | Age (years) | Control (n) | Age (years) | Score |
|---|---|---|---|---|---|---|---|
| Parracho (35) | UK | NA | 58 | 7 ± 3.76 | 10 | 6 ± 2.88 | 8 |
| Kang (29) | USA | NA | 20 | 6.7 ± 2.7 | 20 | 8.3 ± 4.4 | 7 |
| Finegold (36) | USA | NA | 11 | 2–13 | 8 | 2–13 | 7 |
| Inoue (37) | Japan | NA | 6 | 3–5 | 6 | 3–5 | 6 |
| Strati (30) | Italy | Cohort | 40 | 10 (5–17) | 40 | 7 (3.6–12) | 8 |
| Wang (34) | Australia | NA | 23 | 10.25 ± 0.75 | 9 | 9.5 ± 1.25 | 6 |
| De Angelis (23) | Italy | NA | 10 | 4–10 | 10 | 4–10 | 5 |
| Adams (32) | USA | NA | 58 | 6.91 ± 3.4 | 39 | 7.7 ± 4.4 | 7 |
| Gondalia (33) | Australia | NA | 28 | 2–14 | 25 | NA | 6 |
NA, not available.