POPULATION DISTRIBUTION OF FRANK-VECTORCARDIOGRAPHIC MEASUREMENTS OF HEALTHY JAPANESE MEN
書誌事項
- タイトル別名
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- Population Distribution of Frank Vector
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抄録
For elucidation of the type of population distribution of Frank-vector-cardiographic items of normal Japanese population, forty-eight measurements were obtained from 364 healthy Japanese men in the fourth decade. These measurements were studied with Fisher's g test of normality of population distribution, which showed that normal population distribution could be assumed in only six items (12.5%)-the maximal QRS vector angle and the directional QRS-T angle in the frontal plane, Rx and Tz height, Qz duration, and anterior accession time. The frontal maximal T vector angle was regarded to have an approximately normal population distribution. In the remaining forty-one items logarithmic normalization of distribution was attempted with a transformation formula, Y=Log10 (kX+c). Being applied to Y's, the variate logarithm-transformed with an appropriate value of c, Fisher's g test accepted the null hypothesis of normality of population distribution in 27 items (56.3%); in other words, the population distribution of 27 items was lognormal. These included the magnitudes of maximal QRS and T vectors and T/QRS ratios in the three projection planes, and some of vector angles. The population distribution was usually lognormal in scalar amplitudes and ratios except for items related to Q and S waves in leads X and Y. Bimodality of distribution was seen in six items (12.5%), which consisted of the maximal QRS vector angle and the QRS-T angles in the horizontal and left sagittal planes. In these planes the maximal QRS vector and the directional QRS-T angles showed bimodality attributed to combination of two normal distributions. Three of the four QRS-T angles in these planes and also the horizontal maximal QRS vector angle were lognormalized, although a lesser degree of bimodality still remained after seemingly successful logarithmic transformation in respect to the tg statistics. Chi-square test accepted the null hypothesis of exponential population distribution in four items (8.4%), which included the depth of Qx, Sx, and Sy, and S/(S+R) ratio in lead Y. Exponential approximation appeared much better than normal one in the rest of measurements related to Q and S waves in leads X and Y. The following conclusions were drawn form the present study: i) statistical tests based on nonmal population distribution should be carefully applied to Frank-vectorcardiographic measurements of healthy Japanese men in the fourth decade and, presumably, of healthy Japanese adults regardless of age and sex; and ii) logarithmic transformation is an efficient means to normalize a skewed distribution in the majority of measurements.
収録刊行物
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- JAPANESE CIRCULATION JOURNAL
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JAPANESE CIRCULATION JOURNAL 39 (8), 895-903, 1975
社団法人 日本循環器学会
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詳細情報 詳細情報について
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- CRID
- 1390001206433223936
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- NII論文ID
- 130003546311
- 110002589736
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- NII書誌ID
- AN00191970
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- COI
- 1:STN:280:DyaE28%2FivVSnsA%3D%3D
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- ISSN
- 13474839
- 00471828
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- NDL書誌ID
- 1620686
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- PubMed
- 1165601
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可