mean age and standard deviation is 32.86 ± 12.76 and 
31.48 ± 11.83 (Na, 2007).
 
Particular “confounding“ factors such as age, 
smoking, body mass index (BMI), sex, and infection 
also have a bearing on levels of IL-6 and TNF-α 
(Himmerich, 2009). 
 
Table 2: Mean Negative Scale of PANSS in Schizophrenic 
Patients 
Variable 
Mean SD p 
PANSS 
Negative 
30,42 1.691 0,002 
*Shapiro-Wilk test 
 
Table 2. shows that Negative scale of PANSS with 
mean of 30,42 and standard deviation 1,691. From the 
results of normality test data using Shapiro-Wilk 
found p value = 0.002 (p <0.05), so it can be 
concluded the data is not normally distributed. 
Fan at.el, show serum TNF-α levels showed a 
significant negative association with PANSS total 
score (r = −0.210, p < 0.01) and negative subscore (r 
= −0.300, p < 0.01) (Fan, 2015).
 
Table 3 : Mean  TNF-α serum level  in Schizophrenic 
Patients 
Variable Mean  SD  p 
TNF-α 
22.31938 23.24290 0.000 
*Shapiro-Wilk test 
 
Table 3. shows that TNF-α is 22.31938 and deviation 
standard 23.24290. From the results of normality test 
data using Shapiro-Wilk found p value = 0.000 (p 
<0.05), so it can be concluded the data is not normally 
distributed. 
In a study conducted by Theodoropoulou in 
Athens showed significantly higher levels of TNF-α 
in treatment-treated chronic schizophrenic patients 
(26 ± 8 pg / ml) compared with healthy controls (16 
± 6 pg / ml) with p <0.001 (Jiang, 2013). 
Prior to the correlative test on the baseline data, 
firstly tested the normality of data where the variable 
of Negative Scale PANSS tested normalization using 
Shapiro Wilk Test because the sample amount is less 
than or equal to 50 and it is found that the variable of 
PANSS Negative Scale Distribution is abnormal 
therefore correlative test of baseline data using 
Spearman Correlation test. 
Table 4 : Correlation Levels of Serum Tumor Necrosis 
Factor-Alpha (TNF-α) And Negative Scale PANSS 
Levels of Serum Tumor Necrosis Factor – 
Alpha 
(TNF-α)
 
Negative Scale PANSS 
r = 0,403 
p = 0.004 
n = 50 
*Spearman test 
 
Spearman correlation test serum level Tumor 
Necrosis Factor-Alpha (TNF-α) and PANSS 
Negative Scale obtained p value <0.05 and concluded 
that there is correlation between serum serum Tumor 
Necrosis Factor-Alpha (TNF-α) and Negative Scale 
PANSS Strength relationship between serum levels 
Tumor Necrosis Factor-Alpha (TNF-α) and Negative 
Scale PANSS large 0.403 shows a positive 
correlation with moderate correlation strength (r = 0.4 
-0.6). 
4  DISCUSSION 
(Al-Asmari, 2014)showed that TNF-α levels in 
schizophrenic patients (27.04±4.11) were 
significantly higher than normal controls 
(17.25±3.20) an imbalance between proinflammatory 
and antiinflammatory cytokines may be involved in 
the pathophysiology of schizophrenia through 
various mechanisms (Asmari, 2014).
 
The (Petrescu, 2010) study showed a further 
increase in serum TNF-α levels in patients with daily 
tobacco exposure of more than 1 pack / day. There 
was no significant difference between serum TNF-α 
levels of nonsmokers and those who smoked less than 
1 pack / day. This suggests that active smokers who 
cause inflammation usually require a significant 
amount of exposure. So based on this study it can be 
concluded that heavy smoking can lead to a 
significant increase in serum levels of TNF-α and C-
Reactive Protein (CRP), which supports an imbalance 
between proinflammatory and antiinflammatory 
factors. TNF-α concentrations are elevated in healthy