Background and Objective: In recent years, management of patients with chronic low back pain has been focused on transversus abdominis and multifidus muscles. The evidences have demonstrated dysfunction of these muscles in these patients. This study was aimed to compare the usefulness of motor-control exercises and conventional exercises on the lumbar local stabilizing muscles thickness, activity limitation and pain in patients with chronic low back pain.
Materials and Methods: A double-blind, randomized clinical trial was conducted at Razmjo-Moghadam Physiotherapy Clinic, Zahedan University of Medical Sciences, in 2006-2007. Forty-nine patients with chronic low back pain were randomly assigned to either a motor-control (n=25) or a conventional exercise (classic abdominal and back extensor exercises) group (n=24). Before and after intervention, multifidus and abdominal muscles thickness (mm) was measured using a 7.5 MHz B-mode transducer ultrasound, pain and activity limitation (both ordinal) were assessed using visual analog scale and Back Performance Scale, respectively. A 16 session exercise program, for 8 weeks, twice weekly, and 30 minutes per session was performed for both groups. Independent T-test, Mann-Whitney, paired T-test and Wilcoxon tests were used for comparing the pre-treatment and post-treatment inter-group and intra-group test results, res pectively.
Results: The mean transversus abdominis thickness increased from 1.87±0.63 mm to 2.39±0.63 mm in the motor- control group and from 1.93±0.49 mm to 2.22±0.47 mm in the conventional group (P<0.0001). The mean multifidus thickness increased from 8.63±2.37 mm to 9.69±2.49 mm in the motor control group and from 8.83±1.53 mm to 9.26±1.56 mm in the conventional group (P<0.0001). There was no significant difference between the two groups after treatment with the exception of pain severity (P>0.05). More pain relief was achieved in motor- control group (P=0.015).
Conclusion: The results showed that both motor-control and conventional exercises can cause increase in transversus abdominis and multifidus thickness, lumbar mobility and pain reduction in patients with chronic low back pain with no signs of spinal instability. However, the motor control exercises are more effective than conventional exercises in pain reduction.

Background and Objective: Screening and timely diagnosis of positive individuals is one of the important issues in controlling pandemic of Covid-19. Early and timely diagnosis of asymptomatic individuals, contact tracking, disconnection of Covid-19 transmission chain through early detection of patients and decreasing R0 were the main objectives of the current study.
Materials and Methods: The Covid-19 outpatient sampling detection project started in Zanjan province on March 26, 2020 and samples were taken from people suspected of having Corona Virus and people in contact with these patients.
Results: All 31,937 cases (48% male, 52% female) who had referred to Comprehensive Health Care Centers until May 16, 2020, were selected. A considerable percentage of incidences were observed in Zanjan and Khodabandeh cities. 20% of the examined samples had positive results. A substantial incidence was found in the age group of over 70 -year- old. Following implementation of the outpatient screening project, R0 fell below 1 in the province.
Conclusion: Prior to the implementation of Covid-19 laboratorial outpatient screening project, the value of R0 was 1.4 in Zanjan province. However, this value fell below 1, after implementation of the laboratorial outpatient screening indicating that the principal way to effectively control Covid -19 is to detect positive cases and manage them.

Background and Objective: This study was conducted to shed light on the hidden relationships, trends, and patterns of the teenagers’ mental health dataset based on data mining techniques.
Materials and Methods: The proposed method has four parts as follows: data preprocessing, data cleaning, target class selection, and extracting rules. The classes included inappropriate, moderate, and acceptable. The rules were extracted separately by implementing ID3, CHAID, and rule induction on the Caspian 5 dataset.
Results: It was found that the teenagers who rarely drink carbonated soda and have dinner seven days a week, have acceptable status of mental health. Besides, watching TV and playing computer games for 4 hours or more per week, drinking tea and packaged juices, eating cakes, cookies, pastries, biscuits, and chocolate weekly  could lead to inappropriate status of  mental health.
Conclusion: An attempt to improve health especially in youth is one of the important concerns of every country.  The rules express the negative impact of soda on mental health. Besides, it can be concluded that there is a direct relationship between having breakfast and mental health.