highly significantP < 0.000001
Significant differences were observed between the SIDS and non-SIDS groups: the presence of thymic petechiae in SIDS (89.5%) compared with non-SIDS (47.7%) was highly significant ( P < 0.000001; OR 9.38 (CL 4.5 to 19.9), and their absence was more frequent in non-SIDS (52.3%) compared with SIDS cases (10.4%) ( P < 0.000001).