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. Author manuscript; available in PMC: 2014 Aug 1.
Published in final edited form as: Biol Psychiatry. 2013 Apr 25;74(3):204–211. doi: 10.1016/j.biopsych.2013.03.006

Table 2.

Total TI Frequencies in MARBLES Placentas Compared With Poisson Predicted Frequencies in Control Placentas

Total TIs Cutoff M+ M− C+ C− Sens Spec LR+ LR− OR
1 77 40 32 68 66 68 2.1 .50 4.1
2 48 69 8 92 41 92 5.1 .64 8.0
3 28 89 0 (.8a) 100 (99.2a) 24 99 30.2 .77 39
4 22 95 0 (.08a) 100 (99.9a) 19 99.9 242 .81 290

LR+, the positive likelihood ratio; LR−, the negative likelihood ratio; other abbreviations as in Table 1.

a

Frequencies of TIs in parentheses were estimated from the Poisson distribution of the control placentas (Figure 3A).