valid or not. For categorical variables, you need at least five successes and five failures for the interval to be valid. For continuous variables, you need a sample size greater than 30, or normality n"p = number of successes n' q = number of failures q =1 -p CATEGORICAL: FIVE FAILURES (np>5) AND FIVE SUCCESSES: VALID CI CONTINUOUS: SAMPLE SIZE, n > 30 or check normality: VALID CI VARIABLES CT VALID / NOT VALID REASON SEX F - 0.4

5 M- 0.5

5 RACE B- 0.03 5 D- 0.020.006 Not Valid np*5 H-0.055) W-0.255) ED LEVEL BD- 0.105 NHS-0.2-0.13 Not Valid NP>5 MARITAL STATUS DIV-0.18-0.36 valid MR-0.33-0.54 Valid Np5 5NG-0.155 SMOKE N- 0.62-0.82 Valid Np