Table III.
Comparison between persistent and nonpersistent antibodies: categorical variables.
| Persistent | Non- persistent | p | ||
|---|---|---|---|---|
| Sex | F | 272 | 152 | NS |
| M | 150 | 99 | ||
| Multiple alloantibodies | No | 249 | 158 | NS |
| Yes | 173 | 93 | ||
| Period of detection* | 1 | 234 | 93 | <0.001 |
| 2 | 188 | 158 |
Frequency distribution of some categorical variables. The chi-square statistics was calculated to test for significance.
NS: statistically not significant.
*
The period of detection was divided into two decades (1: from 1989 to 1998; 2: from 1999 to 2008).