Because the PHQ-2 was measured twice during follow-up, we created a categorical variable: negative depressive symptoms in both years, one positive screen for depression, and positive screens for depressive symptoms in both years.
Predictors were defined for A_HSCORE of nine antigens (continuous; 1 4) and dichotomized A_HSCORE (categorical: negative if HSCORE=1; positive otherwise).
In spite of the slow start of the interviews, we found that attitudes changed throughout each interview from at times quite robust and categorical negative responses to the question of possible dilemmas in medical decision making to a more nuanced and positive response and enthusiastic discussion as the interview proceeded.
The results were expressed according to the classification previously described by Shaw et al. [ 32] and results were transformed as a categorical variable considering positive those greater than zero and negative those with negative results equal to zero.
The horizontal axis showing H. pylori serology is transformed from a categorical variable (i.e., positive or negative) to a continuous variable of antibody titer.
Next, the methylation status of the DCC and UNC5C promoter was analyzed as a categorical variable (positive, methylation level >5 %; negative, methylation level < 5%%).
Clinicians usually regard the results of H. pylori serology as a categorical variable (i.e., positive or negative), while not considering the actual titer of anti- H. pylori antibodies.
A categorical analysis of individual IGFBP-3 scores (negative versus 1+ versus 2+) in DCIS showed that 97%3232 of 33) of IGFBP-3-positive DCIS were ER-negative versus 80% of ER-positive DCIS (P = 0.037) (Table 1).
Results were reported as a continuous variable for the measurement of OD values and as a categorical variable for the final result (positive versus negative).
This is the extreme form of a categorical test, in which there are only two result categories, positive and negative.
The analyses of PRNT titers were performed in a categorical fashion using the cut-off point of 2.7 log10IU/mL as a threshold to segregate positive from negative results.
