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Table 1 Distributions of affected sibling pair sizes

From: Use of supplementary phenotype to identify additional rheumatoid arthritis loci in a linkage analysis of 342 UK affected sibling pair families

Size of sibling pair No. of families No. of subjects Mean onset age (years ± standard error)
2 306 612 -
3 31 93 -
4 3 12 -
5 1 5 -
6 1 6 -
All 342 728 41.63 ± 0.51
Females - 537 41.44 ± 0.61
Males - 191 42.17 ± 0.89