Table 3.
Mean, Standard Deviation, Median, and Range of Zone Diameters (mm) for Essential Oils Against Gram-Negative, Carbapenem-Susceptible Clinical Isolates
| Species (n) | Oregano | Thyme | Manuka | Clove | Tea Tree | Thieves | Meropenem | |
|---|---|---|---|---|---|---|---|---|
| ESBL Escherichia coli (19) | Cinnamon Bark | |||||||
| Mean (SD) | 23.6 (0.84) | 26.8 (1.69) | 29.7 (0.82) | 19.7 (1.34) | 12.8 (0.63) | 9.4 (0.52) | 18.8 (1.81) | 30.0 (1.81) |
| Median, range | 23, 2 | 26, 5 | 30, 3 | 20, 4 | 13, 2 | 9, 1 | 18, 1 | 30, 7 |
| ESBL Klebsiella pneumoniae (7) | ||||||||
| Mean (SD) | 21.3 (3.50) | 15.4 (1.27) | 22.3 (1.60) | 6.0 (0) | 10.7 (1.38) | 14.4 (0.79) | 11.6 (1.41) | 30.3 (0.95) |
| Median, range | 23, 10 | 15, 19 | 22, 5 | 6, 0 | 10, 4 | 15, 2 | 12, 3 | 30, 3 |
| Enterobacter spp (10) | ||||||||
| Mean (SD) | 18.5 (5.15) | 14.8 (5.60) | 22.3 (4.08) | 6.3 (0.48) | 9.8 (2.44) | 13.6 (3.27) | 11.5 (3.10) | 26.4 (4.86) |
| Median, range | 20.5, 14 | 20.5, 14 | 21, 14 | 6, 1 | 10, 8 | 14.5, 12 | 11, 10 | 27, 17 |
| Pseudomonas aeruginosa (4) | ||||||||
| Mean (SD) | 13.0 (11.27) | 11.0 (7.81) | 28.5 (13.08) | 10.0 (6.16) | 11.0 (5.83) | 8.5 (3.0) | 13.8 (6.24) | 12.8 (2.22) |
| Median, range | 20, 7 | 7, 14 | 27.5, 27 | 7.5, 13 | 10.5, 11 | 8, 6 | 14, 13 | 13, 5 |
Abbreviations: ESBL, extended-spectrum beta-lactamase-producing; SD, standard deviation.