Variables
Exposed group
Non-exposed group
P-value
Frequency
Percent
Frequency
Percent
Amount of blood loss
<500 ml
21
67.74
37
63.79
0.76
500-1000 ml
9
29.03
20
34.48
1000-1500 ml
1
3.23
1
1.72
>1500 ml
0
0
0
0
Total
31
100
58
100
Type of anaesthesia
0.33
General
16
51.61
27
46.55
Spinal
15
48.39
31
53.45
Total
31
100
58
100
IV induction agent used
0.93
Ketamine
7
43.75
12
44.44
Thiopental
9
56.25
15
55.56
Total
16
100
27
100
Dose of reversal agent used
<the recommended dose
4
25
7
25.93
0.65
recommended dose
12
75
20
74.07
>the recommended dose
0
0
0
0
Total
16
100
27
100
Duration of surgery<1 hour
11
35.48
18
31.03
0.88
1-2 hrs
20
64.52
40
68.97
>2 hrs
0
0
0
0
Total
31
100
58
100
Duration of anaesthesia<1 hour
11
35.48
18
31.03
0.88
1-2 hrs
20
64.52
40
68.97
>2 hrs
0
0
0
0
Total
31
100
58
100
Mean systolic blood pressure change
7.058
5-10%
8.11%
1-Jul
0.76
Table 2:
Clinical factors which affect the incidence of post-operative nausea and vomiting, in Ayder referral hospital Mekelle, northern Ethiopia, 2013.