Table 4. Factors for false negative smear microscopy results among the studied laboratories in West Hararghe Zone, Oromia Region, 2015.
| Variables | False negative | COR (95%CI) |
AOR (95%CI) |
P- value |
||
|---|---|---|---|---|---|---|
| No | Yes | |||||
| Separate microscope | No | 8 | 4 | 1.01(0.83, 1.23) | ------ | |
| Yes | 34 | 9 | 1 | ------ | ||
| IQC practice | No | 32 | 11 | 2.43 (1.09, 5.44) | 2.90 (1.25, 6.75) ** | 0.013 |
| Yes | 10 | 2 | 1 | 1 | ||
| Preventive maintenance | No | 27 | 8 | 1.06(0.85, 1.21) | 1.02(0.85, 1.26)* | 0.021 |
| Yes | 15 | 5 | 1 | 1 | ||
| Good specimen quality | No | 30 | 10 | 0.87(0.78, 0.98) | ------ | |
| Yes | 12 | 3 | 1 | ------ | ||
| Good smear size |
No | 30 | 9 | 1.05(0.86, 1.30) | 1.05(0.87, 1.33)* | 0.005 |
| Yes | 12 | 4 | 1 | 1 | ||
| Good smear thickness | No | 28 | 10 | 1.06 (0.86, 1.29) | 1.04 (0.69, 1.58)* | 0.023 |
| Yes | 14 | 3 | 1 | 1 | ||
| Good staining |
No | 18 | 9 | 2.50 (1.12, 5.58) | 2.16 (1.01, 5.11) ** | 0.012 |
| Yes | 24 | 4 | 1 | 1 | ||
| Evenness of the smear |
No | 27 | 10 | 1.04(1.03, 1.05) | 1.22(0.31, 4.88)* | 0.034 |
| Yes | 15 | 3 | 1 | 1 | ||
IQC: Internal Quality Control; COR: Crude Odds Ratio; AOR: Adjusted Odds Ratio; CI: Confidence Interval
NB** = significant (P<0.05).
Adjusted*: for separate microscope, IQC practice, preventive maintenance, specimen qualities, smear size, smear thickness, staining and evenness of the smear.