Saddleback Journal of Biology - Saddleback College

Fall 2009 Biology 3B Paper
Mean Change in Diastolic Blood
Pressure (mmHg)
1.0
0.0
-1.0
-2.0
-3.0
-4.0
-5.0
-6.0
Frequent
First Time
Frequency of Donation
Mean Change in Mean Arterial
Pressure (mmHg)
1.0
0.0
-1.0
-2.0
-3.0
-4.0
-5.0
Frequent
First Time
Frequency of Donation
Figure 2. Mean change in systolic blood pressure
was not significantly different for frequent donors
and first-time donors (p>0.05, two-tailed, unpaired
T-test).
The results of the two-tailed, unpaired T-test for
the change in pre- and post-donation heart rate
between frequent and first time donors indicated that
there was not a significant difference (T-test
assuming unequal variances, t=-0.41, df=40, and
p>0.05) (Figure 3). The results of the two-tailed,
unpaired T-test for the change in pre- and postdonation
MAP between frequent and first time
donors indicated that there was not a significant
difference (T-test assuming unequal variances, t=-
0.89, df=38, and p>0.05) (Figure 4).
Mean Change in Heart Rate
(BPM)
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Frequent
First Time
Frequency of Donation
Figure 3. Mean change in heart rate was not
significantly different for frequent donors and firsttime
donors (p>0.05, two-tailed, unpaired T-test).
Figure 4. Mean change in heart rate was not
significantly different between frequent donors and
first-time donors (p>0.05, two-tailed, unpaired T-
test).
The second set of statistical tests ran
compared systolic and diastolic blood pressure, heart
rate, and MAP for male and females. For frequent
male and female donors, there was no significant
difference in the systolic (T-test assuming unequal
variances, t=0.61, df=17, and p>0.05) (Figure 5) or
diastolic blood pressures (T-test assuming unequal
variances, t=-0.19, df=17, and p>0.05) (Figure 6).
For first time male and female donors, there was also
no significant difference in the systolic (T-test
assuming unequal variances, t=-0.16, df=20, and
p>0.05) (Figure 7) nor diastolic blood pressures (Ttest
assuming unequal variances, t=-0.92, df=18, and
p>0.05) (Figure 8).
Mean Change in Systolic Blood
Pressure (mmHg)
1.0
0.0
-1.0
-2.0
-3.0
-4.0
-5.0
-6.0
Male
Gender
Female
Figure 5. Mean change in systolic blood pressure
was not significantly different between frequent male
donors and frequent female donors (p>0.05, twotailed,
unpaired T-test).
60
Saddleback Journal of Biology
Spring 2010