Table 2.
All | Cause found | Unknown causes◆ | ||
---|---|---|---|---|
Forceps birth | Further causes | |||
N | 121 | 63 | 22 | 36 |
Males to Females | 67:54 | 41:22✙ | 11:11 | 16:20 |
Age at onset of symptoms | ||||
Years | 0.6 [0.4–1.0] | 0.5 [0.4–0.6] | 5.8● [1.3–18] | 0.5 [0.4–1.2] |
≤ 18 years, N | 113 | 63 | 16 | 34 |
Time to diagnosis | ||||
Months | 7.2 [1.2–24] | 7.2 [1.2–36] | 6.0 [0.0–16] | 3.6 [0.0–17] |
≥ 12 months, N | 55 | 30 | 12 | 13 |
Familiarity, N | 7 | 3 | 0 | 4 |
Laterality | ||||
Unilateral | 100 | 59 | 20 | 21 |
Right | 56 | 36 | 12 | 8 |
Left | 38 | 19 | 8 | 11 |
Unspecified | 6 | 4 | 0 | 2 |
Bilateral | 21 | 4 | 2 | 15⤬ |
Allergy investigation | 60 | 40 | 4 | 16 |
Without testing | 25 | 16 | 8 | 1 |
With testing | 35 | 24 | 3 | 8 |
◆Delivery was explicitly non-forceps-assisted in 31 of the 36 cases (no corresponding information was available for the remaining cases). ✙P < 0.05 versus non-forceps. ●P < 0.05 versus forceps birth and unknown causes. ⤬P < 0.0001 versus further cases and forceps-assisted birth