Background and Aims. With technological advances in NICUs the survival rate of preterm infants has been increased. Because NICU environment is a potent source of stress for infants, its modification is an essential measure to decrease infants' morbidity. The purposes of this study were to compare the effects of wearing earmuff and provision silence for infants on their motor responses and gaining weight. Methods. In a randomized clinical trial 96 preterm infants were enrolled. Their motor responses were evaluated for two consecutive days in the morning and afternoon shifts, in the groups of earmuff and silence, and at similar time points in the control group. Also their weight was measured at days 1 and 10. Results. In the two intervention groups, means of motor responses in infants were significantly less than in the control group, and weight gain of infants was more than the control group. However weight gain was more pronounced in the earmuff group. Conclusion. Both interventions led to decreasing number of motor responses and improvement of weight gain pattern, but these effects were more pronounced in earmuff group; thus because implementation of silence in NICUs has many barriers, it is suggested to use earmuff for preterm infants in these units. This trial obtained IRCT registration number IRCT2012092010812N2.

Objective: Establish the reliability of the jaw index to objectify the relationship between the maxilla and mandible in healthy newborns. Design: Cohort study. Setting: Tertiary setting. Patients: A total of 52 healthy newborns were included to detect an inter and intraclass correlation coefficient (ICC) of 0.8 with a 95% confidence interval (95% CI) of width 0.3. Inclusion criteria were children born full term without respiratory or feeding problems, and without congenital malformations or facial deformities due to birth trauma. Uncooperative patients were excluded. Interventions: The jaw index, a measuring tool for objectifying micrognathia in children suspected of having Robin sequence, was used. An ICC of greater than 0.8 was considered clinically relevant. Main Outcome Measure(s): Primary outcomes are the reliability of the jaw index expressed as interclass correlation coefficient and ICC. Secondary outcomes are the mean jaw index and mean length of the mandible, maxilla, and the alveolar overjet. Results: An interclass correlation coefficient of 0.74 (95% CI: 0.49-0.86) and an ICC of 0.81 (95% CI: 0.66-0.89) were found. The mandible had an average length of 162.6 mm (standard deviation [SD] 11.1), the maxilla 168.7 mm (SD 9.4), the alveolar overjet 2.0 mm (SD 0.60), and the mean jaw index was 2.1 (SD 0.64). Conclusion: The jaw index is a consistent instrument between different observers as well as for one observer measuring consecutively in the same child, to objectify the size of the lower jaw compared to that of the upper jaw in healthy newborns.

Background: Driving is a challenging job. Drivers always face the high risk of musculoskeletal disorders (MSDs). Educational interventions could be effective in preventing and controlling these disorders. The present study aims to assess the effectiveness of an educational physical activity intervention in preventing MSDs among bus drivers in Isfahan, Iran. Methods: This quasi-experimental study was conducted on 60 urban bus drivers, who were selected using multistage sampling. They were evaluated at two time points, namely before and three months after the intervention. The intervention was conducted in three 90-minute sessions. The HBM-based educational content was delivered through lectures, PowerPoint presentations, videos, practical demonstrations of corrective exercises, and educational pamphlets. Data were analysed using the SPSS program, version 20, the paired t -test, and the independent t -test. Results: Before the intervention, there was no significant difference between the two groups with respect to the mean scores of the HBM constructs. However, later on, the mean scores of perceived susceptibility, perceived severity, perceived benefits, perceived barriers, self-efficacy, and behaviour increased significantly in the intervention group, compared with those in the control group. ( P < 0.001). Conclusions: The results showed that the physical activity as an HBM-based educational intervention had a positive effect on the prevention of MSDs in urban bus drivers.

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