Observer 2    
    + -    
Observer 1 + 9 4 13 43.33%
- 11 6 17 56.67%
    20 10 30  
    Actual agreement= 50.00%  
    Chance agreement= 47.78%  
    Kappa statistic= 0.04  
Table 2: Correlation between positive IgG and sever ITP.
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