Even in a well-designed and controlled study, missing data occurs in almost all research. Missing data can reduce the statistical power of a study and can produce biased estimates, leading to invalid conclusions. This manuscript reviews the problems and types of missing data, along with the techniques for handling missing data. The mechanisms by which missing data occurs are illustrated, and the methods for handling the missing data are discussed. The paper concludes with recommendations for the handling of missing data.
Bias (Epidemiology) ; Handling (Psychology)

The use of cotton plug as closure of a bacterial culture flask had been reported to have many disadvantages such as inhibitory nature of cotton to certain microbes, chances of contamination during handling and accumulation of used cotton as biological waste. To overcome the disadvantages of cotton plugs, we have developed a new method of capping bacterial culture flasks. In the present study, three sets of experiments were conducted, one was to find out the efficiency of bacterial growth in culture flasks closed by either glass caps or cotton plugs and the second set was to find out the chances of getting contamination of sterile broth closed by either glass caps or cotton plugs and the third set was to find out the evaporation of water in conical flasks closed by glass caps or cotton plug. The results showed that the bacterial cultures closed by glass caps showed better growth with less chance of contamination and evaporation of the culture media. By this method, the bacterial culture work is made very simpler than using cotton plug.
Culture Media ; Glass ; Handling (Psychology) ; Water

OBJECTIVE: To investigate the recognition about clinical application of "neurodevelopmental treatment (NDT)". METHOD: We surveyed on the recognition for Bobath and NDT concepts and its training programs provided by Korean Academy of Rehabilitation Medicine from Jan 2009 to Feb 2009. The survey was made for physiatrists and physical therapists (PTs), separately. One hundred twelve physiatrists and 322 PTs have participated. RESULTS: In physiatrist, interest in NDT was very high (98%), and the need for further knowledge of NDT was also high (95%). Though the NDT was mainly used techniques in neuro-rehabilitation setting, the expectation about effectiveness of it was moderate (56%) and the requirement of changing concepts of the NDT was very high (93%). PTs have carried out NDT most frequently with Bobath's concepts, but they also did not regard NDT as the best procedure. PTs emphasized the importance of their handling technique in NDT practices and also had high interest in the other maneuvers beside Bobath's. CONCLUSION: Physiatrists and PTs regard NDT as one of the most important treating method for patients with brain lesions, but it is not approved as the most effective method yet. Nowadays NDT is changing or adapting, with discarding some of the old Bobath's concepts and adding new modern scientific knowledge. Therefore we suggest that physiatrists to give PTs the revised NDT concepts and evidence based the other therapeutic methods. And the NDT needs to be verified its therapeutic efficacy with evidence based view points through proper studies.
Brain ; Handling (Psychology) ; Humans ; Physical Therapists

Retrograde intubation is an alternative option for gaining airway access for patients with a difficult airway.We report a successful management of a kinked J-tip guidewire within a tracheal lumen with flexible fiberoptic laryngoscope in a patient with type II odontoid fracture.It is helpful to adjusting the depth of angiocatheter and handling of J-tip guidewire if J-tip guidewire does not come out into the oral cavity at the expected length during retrograde intubation.
Handling (Psychology) ; Humans ; Intubation ; Laryngoscopes ; Mouth

Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is becoming a standard method for invasive mediastinal staging and for the diagnosis of paratracheal and peribronchial lesions. It is essential to understand the technical aspects of EBUS-TBNA to ensure safe and efficient procedures. In this review, we discuss the practical aspects to be considered during EBUS-TBNA, including anesthesia, manipulation of equipment, understanding mediastinal ultrasound images, target selection, number of aspirations needed per target, sample handling, and complications.
Anesthesia ; Aspirations (Psychology) ; Bronchoscopy ; Handling (Psychology) ; Lung Neoplasms ; Needles* ; Ultrasonography

BACKGROUND/AIMS: Various strategies to expand the ablation zone have been attempted using hepatic radiofrequency ablation (RFA). The optimal strategy, however, is unknown. We compared hepatic RFA with an internally cooled wet (ICW) electrode and vascular inflow occlusion. METHODS: Eight dogs were assigned to one of three groups: only RFA using an internally cooled electrode (group A), RFA using an ICW electrode (group B), and RFA using an internally cooled electrode with the Pringle maneuver (group C). The ablation zone diameters were measured on the gross specimens, and the volume of the ablation zone was calculated. RESULTS: The ablation zone volume was greatest in group B (1.82+/-1.23 cm3), followed by group C (1.22+/-0.47 cm3), and then group A (0.48+/-0.33 cm3). The volumes for group B were significantly larger than the volumes for group A (p=0.030). There was no significant difference in the volumes between groups A and C (p=0.079) and between groups B and C (p=0.827). CONCLUSIONS: Both the usage of an ICW electrode and hepatic vascular occlusion effectively expanded the ablation zone. The use of an ICW electrode induced a larger ablation zone with easy handling compared with using hepatic vascular occlusion, although this difference was not statistically significant.
Animals ; Catheter Ablation ; Dogs ; Electrodes ; Handling (Psychology) ; Liver

As techniques and device technology have improved, the success rates and long patency of ilio-femoral occlusive disease have also improved. In the case of extensive iliac occlusive disease, however, wire passage and handling remain a challenge due to the relatively weak guiding catheter backup support with the contralateral femoral approach. There has been no report on methods to overcome this problem. We performed a successful percutaneous translunimal angioplasty for long ilio-femoral occlusive disease including the iliac ostium by a dual approach including simultaneous brachial and contralateral femoral arteries for subintimal angioplasty.
Angioplasty ; Catheters ; Femoral Artery ; Handling (Psychology) ; Iliac Artery ; Stents

The aim of this study was to develop a method for measuring the slumping resistance of flowable resin composites and to evaluate the efficacy using rheological methodology. Five commercial flowable composites (Aelitefil flow:AF, Filtek flow:FF, DenFil flow:DF, Tetric flow:TF and Revolution:RV) were used. Same volume of composites in a syringe was extruded on a glass slide using a custom-made loading device. The resin composites were allowed to slump for 10 seconds at 25degrees C and light cured. The aspect ratio (height/diameter) of cone or dome shaped specimen was measured for estimating the slumping tendency of composites. The complex viscosity of each composite was measured by a dynamic oscillatory shear test as a function of angular frequency using a rheometer. To compare the slumping tendency of composites, one way-ANOVA and Turkey's post hoc test was performed for the aspect ratio at 95% confidence level. Regression analysis was performed to investigate the relationship between the complex viscosity and the aspect ratio. The results were as follows. 1. Slumping tendency based on the aspect ratio varied among the five materials (AF < FF < DF < TF < RV). 2. Flowable composites exhibited pseudoplasticity in which the complex viscosity decreased with increasing frequency (shear rate). AF was the most significant, RV the least. 3. The slumping tendency was strongly related with the complex viscosity. Slumping resistance increased with increasing the complex viscosity. The slumping tendency could be quantified by measuring the aspect ratio of slumped flowable composites. This method may be applicable to evaluate the clinical handling characteristics of flowable composites.
Composite Resins ; Glass ; Handling (Psychology) ; Light ; Syringes ; Viscosity

PURPOSE: Several authors reported about the post- traumatic nasal aesthetic complications. However, the studies for functional or intra-nasal complications have been rarely reported. The aim of this study is to observe the incidence of intranasal synechia. METHODS: We reviewed the data from 401 consecutive patients with nasal bone fracture from september 2006 to December 2007. We enforced evaluation with preoperative CT in all patients but postoperative CT within complicated patients. We classified the nasal bone fracture according to the anatomy and severity of fracture. Type I is nasal tip fracture(15%, n=59), Type II is simple lateral without septal injury(38%, n=152), Type III is simple lateral with septal injury(23%, n=92), Type IV is closed comminuted(20%, n=82), Type V is open comminuted or complicated(4%, n=16). We studied 98 patients with nasal bone fracture who had postoperative symptoms or underwent postoperative endoscopic evaluation. And then we evaluated the postoperative endoscopic finding and nasal synechal formation after operation. RESULTS: The incidence of intranasal synechiae was 15%(n=62). According to the endoscopic findings, the incidence of intranasal synechiae was 10%(n=6) in Type I, 8%(n=12) in Type II, 16%(n=15) in Type III, 24%(n= 20) in Type IV, and 56%(n=9) in Type V, respectively. Additionally, the incidence of subjective nasal obstruction and olfactory dysfunction is 18%(n=72) and 13%(n= 51), while the incidence of symptomatic synechiae of nasal obstruction and olfactory dysfunction is 92%(57/ 62) and 55%(34/62). CONCLUSION: We identified relatively high prevalence of nasal obstruction and olfactory dysfunction in nasal synechiae. Based on the results of this study, intranasal synechiae really caused airway obstruction(92%). Our data showed significant relationship between intranasal synechiae and severity of the fracture, because of increasing mucosal handling and destructive closed reductional procedures. First of all, education of delicate procedure regarding this subject should be empathized accordingly.
Handling (Psychology) ; Humans ; Incidence ; Nasal Bone ; Nasal Obstruction ; Prevalence

The purpose of this study was to investigate the status of the safety system and safety education in institutional foodservices in the Changwon and Masan areas. The survey was conducted from February 1 to March 31, 2009 via questionnaires that were sent to 300 dietitians, and 142 dietitians responded. It was determined that most of the safety managers were 'dietitians (87.1%)', whereas facilities/equipment managers consisted of 'dietitians (45.7%)', 'department of facilities management in the organization (36.4%)' and 'outsourced company of facilities management (17.9%)'. Out of the 11 safety practices, seven safety practices showed less than 50% of total implementation ratio, which meant that the safety systems were not functioning properly. Except for 'non-skid shoes (85.9%)', other safety equipment was seldom used. The survey respondents recognized that safety education was very necessary (4.47 points); however, they responded so-so (3.46 points) to the question of whether or not the actual frequency and time spent on safety education were enough. The average time spent on safety education was 28 minutes 11 seconds. Regarding the difficulties in performing safety education, 'not many safety education materials and media (3.44 points)', 'not many varieties in the subjects and contents for safety education (3.40 points)', and 'not much organizational support on safety education (3.33 points)' showed higher scores than 'lack of education time due to workload (3.20 points)'. The following were cited as education materials that should be developed as it is currently difficult to obtain relevant information and data: 'root causes of musculoskeletal injury and preventive measures (15.8%)', 'healthcare and disease preventive exercises for employees who do simple and repetitive works (14.9%)', and 'instruction on safe handling of chemicals (12.7%)'.
Surveys and Questionnaires ; Exercise ; Handling (Psychology) ; Nitroimidazoles ; Organization and Administration ; Shoes ; Sulfonamides