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Degree of HLA incompatibility across HLA loci between mother and child. For mothers for whom data on multiple children were available, each child’s discordance was counted separately
| Allele discordance | Number of discordant | |
|---|---|---|
| Class 1 alleles | Class 2 alleles | |
| Case - HLA class 1 positive | 3.69 (P=0.072) | 4.52 (NS) |
| Control | 3.08 | 4 |
| Case - HLA class 2 positive | 3.29 (NS) | 5.08 (P=0.0029) |
