Table 3.
Contingency tables linking some resistance phenotypes (to ATM, CTX and CAZ) to blaCTX-M PCR results (for blaCTX-M-1 and blaCTX-M-15).
| blaCTX-M PCR | Both negative | Either positive | Both positive | Total |
|---|---|---|---|---|
| ATM resistance | N (%row) | Either positive | N (%row) | |
| R | 3 (2.91%) | 41 (39.8%) | 59 (57.3%) | 103 (100%) |
| I | 4 (19.0%) | 15 (71.4%) | 2 (9.52%) | 21 (100%) |
| S | 25 (33.8%) | 46 (62.2%) | 3 (4.05%) | 74 (100%) |
| Total | 32 (16.2%) | 102 (51.5%) | 64 (32.3%) | 198 (100%) |
| bla CTX-M PCR | Both negative | Either positive | Both positive | Total |
| CTX resistance | N (%row) | N (%row) | N (%row) | |
| R | 7 (4.93%) | 74 (52.1%) | 61 (43.0%) | 142 (100%) |
| I | 7 (30.4%) | 13 (56.5%) | 3 (13.0%) | 23 (100%) |
| S | 18 (54.5%) | 15 (45.5%) | 0 (0%) | 33 (100%) |
| Total | 32 (16.2%) | 102 (51.5%) | 64 (32.3%) | 198 (100%) |
| bla CTX-M PCR | Both negative | Either positive | Both positive | Total |
| CAZ resistance | N (%row) | N (%row) | N (%row) | |
| R | 8 (5.23%) | 85 (55.6%) | 60 (39.2%) | 153 (100%) |
| I | 1 (6.67%) | 10 (66.7%) | 4 (26.7%) | 15 (100%) |
| S | 23 (76.7%) | 7 (23.3%) | 0 (0%) | 30 (100%) |
| Total | 32 (16.2%) | 102 (51.5%) | 64 (32.3%) | 198 (100%) |
| Chi-square for ATM resistance vs. PCR results = 73.02 with 4 df; p ≤ 0.0001 | ||||
| Chi-square for CTX resistance vs. PCR results = 62.70 with 4 df; p ≤ 0.0001 | ||||
| Chi-square for CAZ resistance vs. PCR results = 97.98 with 4 df; p ≤ 0.0001 | ||||
Phenotype-genotype associations are tested by Chi-square test for independence. % row = percentage of row total.