• Asian Pacific Journal of Cancer Prevention
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• 제14권6호
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• pp.3865-3869
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• 2013

Background: Cigarette per day (CPD) use is a key smoking behaviour indicator. It reflects smoking intensity which is directly proportional to the occurrence of tobacco induced cancers. Self reported CPD assessment in surveys may suffer from digit bias and under reporting. Estimates from such surveys could influence the policy decision for tobacco control efforts. In this context, this study aimed at identifying underlying factors of digit bias and its implications for Global Adult Tobacco Surveillance. Materials or Methods: Daily manufactured cigarette users CPD frequencies from Global Adult Tobacco Survey (GATS) - India data were analyzed. Adapted Whipple Index was estimated to assess digit bias and data quality of reported CPD frequency. Digit bias was quantified by considering reporting of '0' or '5' as the terminal digits in the CPD frequency. The factors influencing it were identified by bivariate and logistic regression analysis. Results: The mean and mode of CPD frequency was 6.7 and 10 respectively. Around 14.5%, 15.1% and 15.2% of daily smokers had reported their CPD frequency as 2, 5 and 10 respectively. Modified Whipple index was estimated to be 226.3 indicating poor data quality. Digit bias was observed in 38% of the daily smokers. Heavy smoking, urban residence, North, South, North- East region of India, less than primary, secondary or higher educated and fourth asset index quintile group were significantly associated with digit bias. Discussion: The present study highlighted poor quality of CPD frequency data in the GATS-India survey and need for its improvement. Modeling of digit preference and smoothing of the CPD frequency data is required to improve quality of data. Marketing of 10 cigarette sticks per pack may influence CPD frequency reporting, but this needs further examination. Exploring alternative methods to reduce digit bias in cross sectional surveys should be given priority.

• 지식경영연구
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• 제23권2호
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• pp.229-251
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• 2022

온라인 리뷰는 제품에 대한 이전 구매자들의 경험을 제공함으로써 다른 소비자들이 합리적인 구매 의사결정을 하는데 유용하게 활용되고 있다. 하지만 온라인 리뷰가 제품의 질과 특성을 정확히 반영하지 않고 편향되어 작성된다면 온라인 리뷰를 더이상 신뢰할 수 없는 문제가 발생한다. 따라서, 본 연구에서는 대표적인 온라인 리뷰의 편향 중 하나인 과소보고 편향의 특성을 실증 데이터를 통해 살펴보고자 한다. 구체적으로 온라인 게임 플랫폼인 스팀의 14,165개의 리뷰 데이터를 활용하여 과소보고하는 성향을 지니는 리뷰어의 특성을 살펴보고자 하였다. 분석결과, 과소보고하는 리뷰어는 주로 추천 의도를 담은 리뷰를 작성하고, 게임 출시일로부터 짧은 기간 안에 리뷰를 작성하나 다소 긴 시간동안 게임을 플레이한 후 리뷰를 작성하는 경향이 있으며, 높은 가격의 게임을 구매했을 때 리뷰를 작성하는 경향을 보였다. 본 연구는 과소보고하는 리뷰어의 특성을 탐색적으로 살펴보았기에 과소보고 편향에 대한 이해를 확장시키는 기초 연구로서 의미를 지닐 것이다.

• 한국조사연구학회지:조사연구
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• 제10권2호
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• pp.1-21
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• 2009

본 연구는 시간일지 방식의 생활시간조사와 서베이문항 방식의 노동패널 자료를 대상으로 하여 탐색적 수준에서 측정방식의 차이가 성별 가사노동시간 추정에서 어떤 차이를 낳는지를 비교하였다. 연구결과 우리나라의 경우 서베이문항 방식에서 남성은 자신의 가사노동시간을 과다보고하고 여성은 과소보고하는 경향을 나타냈다. 보고차이에 관한 기존연구에 비추어 볼 때 남성의 과다보고는 일치하지만 여성의 과소보고는 매우 독특하다. 하위집단별 가사노동시간 분포를 살펴보면, 남성의 경우 사별/이혼자 집단에서 과다보고의 경향이 뚜렷이 나타난 반면 여성의 경우 유급노동, 돌봄 및 가사노동 부담이 큰 집단에서 과소보고의 경향이 나타났다. 이러한 보고차이는 가사노동과 관련된 젠더화된 사회규범과 시간부족 인식에 비추어 설명될 수 있었다. 기존연구에서는 과소보고에 대한 이론이 제대로 발달되지 않았는데, 본 연구는 시간부족 인식이 여성의 과소보고를 설명하는 중요한 이론적 가설이 될 수 있음을 제언하였다.

• 대한물리의학회지
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• 제18권4호
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• pp.109-119
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• 2023

PURPOSE: The definition and scope of biofeedback are broad and lack a clear framework. Therefore, efforts are needed to clearly understand the exact range and definition of biofeedback based on the research and development conducted to date. Thus, the purpose of this study was to arrive at the definition and scope of biofeedback through a literature review and analysis of its application methods. METHODS: This study is a systematic literature review conducted to understand the various types and effects of biofeedback. International databases such as Google Scholar and PubMed were used. Domestic databases utilized for keyword searches included the Research Information Sharing Service (RISS) and the National Digital Science Library (NDSL). Quality assessment of the selected studies in the selection process was done using the Cochrane risk of bias, and the research was analyzed according to the population, intervention, control, and outcomes (PICO) format. RESULTS: Studies conducted between 2019 and 2021 were selected, with 4 papers falling under physiological classifications and 7 under biomechanical classifications. The quality assessment results showed that random sequence generation, allocation concealment, performance bias, and reporting bias were unclear. Detection bias was moderate, and attrition bias and other biases were low. Out of the 11 papers, 9 dealt with physical function outcomes, 5 with daily life activities, and 3 with mental functions. CONCLUSION: Physiological biofeedback tended to influence psychological factors more than physical functions, while biomechanical biofeedback tended to have a positive impact on physical functions.

• Journal of Nutrition and Health
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• 제32권8호
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• pp.957-966
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• 1999

Underreporting of dietary intake is common and might distort analysis and interpretation of dietary surveys. This study was designed to investigate the degree of underreporting and characterastics of under-reporting group in Korean college female students. Dietary survey of 1-day 24-hour recall method was conducted on 379 college students in Seoul and Chonan areas. Physical activity and life style were aquired from questionnnaires. Underreporting was defined as energy intake(EI) lower than 0.9BMR(based metabolic rate), since EI<0.98BMR is statistically judged as bias in 1-day 24 hour recall. BMR was calculated from Schofield's equation. Proportion of underreporting was 18.7% and it's not so different from one of American or European women. Intake of nutrients except vitamin A by underreporting group was lower than other groups(p<0.001). Proportions of subjects with nutrient intake level less than 75% of Korean RDA were more than 80% in protein, Ca, Fe, vitamin A, riboflavin, niacin, zinc as well as energy. Dietary quality of underreporting group was also worse than other groups. Proportion of subjects less than 3 food groups among 5 food group was higher in underreporting group. The number of foods eaten by underreporting group were also less than those of other groups. BMI and body weight were the largest in underreporting group(p<0.05) and the trial of weight reduction was shown higher trend(p<0.01). Different in PAC and other characteristics between underreporting group and other group were not significant. Not only dietary quantity but also dietary quality were worse in the underreporting group. Furthermore underreporting in college female students seemed to be affected by body weight and concern for weight reduction.

• Journal of Cardiovascular Imaging
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• 제31권4호
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• pp.159-168
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• 2023

BACKGROUND: The gold standard for diagnosis of cardiac tumours is histopathological examination. Cardiovascular magnetic resonance (CMR) is a valuable non-invasive, radiation-free tool for identifying and characterizing cardiac tumours. Our aim is to understand CMR diagnosis of cardiac tumours by distinguishing benign vs. malignant tumours compared to the gold standard. METHODS: A systematic search was performed in the PubMed, Web of Science, and Scopus databases up to December 2022, and the results were reviewed by 2 independent investigators. Studies reporting CMR diagnosis were included in a meta-analysis, and pooled measures were obtained. The risk of bias was assessed using the Quality Assessment Tools from the National Institutes of Health. RESULTS: A total of 2,321 results was obtained; 10 studies were eligible, including one identified by citation search. Eight studies were included in the meta-analysis, which presented a pooled sensitivity of 93% and specificity of 94%, a diagnostic odds ratio of 185, and an area under the curve of 0.98 for CMR diagnosis of benign vs. malignant tumours. Additionally, 4 studies evaluated whether CMR diagnosis of cardiac tumours matched specific histopathological subtypes, with 73.6% achieving the correct diagnosis. CONCLUSIONS: To the best of our knowledge, this is the first published systematic review on CMR diagnosis of cardiac tumours. Compared to histopathological results, the ability to discriminate benign from malignant tumours was good but not outstanding. However, significant heterogeneity may have had an impact on our findings.