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Question

Compute the pooled t-test statistics value for Age (years) in this table using the summary statistics

provided. 


The two-tailed p-value for Age reported in Table 1 is 0.047, which is correct if we consider this a

           pooled t-test.

Summary statistics: Noninfected n = 90 Infected n - 60 p value

Age years 64.8 + 11.8 68.6 + 11.0 0.047

table1.jpg

Infection(-) n =90
Male Gender (%)
67.8
infection(+) n=60
p value
Age (years)
64.8+11.8
73.3
0.467
68.6+11.0
HT (cm)
160.5+9.8
0.047
160.5+8.5
BW (kg)
57.0+10.9
0.995
55.8+11.9
BMI
22.0+3.2
0.515
21.6+4.0
ASA (%)
0.491
0.006
ASA1 (%)
39.5
15.5
ASA2 (%)
55.8
74.1
ASA3 (%)
10.3
History of diabetes mellitus (%)
15.6
26.7
0.096
Total operation time (min)
325+98.2
399+ 122.5
<0.001
Blood loss (g)
366+ 363.0
858+782.4
<0.001
Surgical procedure (total
<0.001
gastrectomy vs. partial gastrectomy)
(%)
Total
22.2
53.3
Partial
77.8
46.7
CRP (mg/dl)
8.4+3.3
9.6+ 3.6
0.035
Hb (g/dl)
12.4 +3.0
11.9+1.7
0.256
Preoperative ADN (ug/ml)
8.9+4.9
10.8+5.2
0.026
0.788
Postoperative ADN (ug/ml)
7.5+4.1
7.3+3.9
0.86+0.2
0.67+0.1
<0.001
ADN ratio
p: Difference in means or rates were tested using Student's t-test or Chi-square test.
HT, height; BW, body weight; BMI, body mass index; ASA, American Society of Anesthesiologists; CRP, C reactive protein; Hb, hemoglob
6129.t001

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