Drops. Similarly, there were no significant differences between those in the highest and lowest Scheltens DWMH score quartiles with respect to the other variables in Table 2 (data not shown). In bivariate Gracillin logistic regression analyses, diastolic BP drop, age and APOEe4 status achieved the lowest p-values (0.124, 0.117 and 0.094, respectively). Due to the rather small subsample, in combination with missing values for the relevant variables, it was not statistically feasible to perform multiple logistic regression analyses using these variables.Statistical AnalysesA total of 82 patients had MRI scans that could be analysed volumetrically (volumetry group), and 139 had scans that could be rated 
semi-quantitatively (the semi-quantitative group) according to the Scheltens scale. The scans of 61 patients were analysed with both methods, yielding a correlation coefficient (Spearman’s rho) of 0.791 (p,0.001) between the scores of the two methods. MannWhitney U-test, Chi-square, Spearman rank order or Fisher’s exact test were used as appropriate. None of the continuous variables 15481974 had a normal distribution, according to the KolmogorovSmirnov test. Potential predictor variables having p-values ,0.25 in bivariate logistic regression analyses were included in stepwise multiple logistic regression analyses, with the response variable defined as being in the highest quartile of total WMH volume ratios or Scheltens deep WMH (DWMH) scores vs. the lowest quartile, respectively. P-values ,0.05 (SMER28 biological activity two-tailed) were considered statistically significant. All statistical tests were performed using PASW Statistics 18, release 18.0.1.ResultsWhen comparing the baseline characteristics of patients undergoing WMH volume analysis with those who were not included in the study, the only significant difference was a higher proportion with Alzheimer’s disease among the participants (volumetry group: Pearson Chi square 14.558, df 1, p,0.001, semi-quantitative group: Pearson Chi square 8.162, df 1, p = 0.006 (Table 1)). In the volumetry group, the only significant difference with respect to relevant clinical characteristics between patients in the highest and lowest WMH quartiles was a lower proportion in the former group with at least one APOEe4 allele (Table 2). In the semi-quantitative group, patients in the highest DWMH score quartile were significantly older than those in the lowest quartile, and the proportion of patients with a previous stroke was significantly higher in the highest quartile. Otherwise, there wereDiscussionThe main finding of our study is that in this sample of older people with mild dementia, WMH were not associated with OH or low standing systolic BP. Only APOEe4 status (volumetry) and age (volumetry and semi-quantitative analysis) were independently associated with WMH volumes. Thus, our hypothesis that WMH in mild dementia are associated with OH was not supported. This finding is in contrast to some previous studies. However, 12926553 some of these studies were performed in older people with major depression [16,18,19],OH and WMH in Mild DementiaTable 1. Demographic and clinical characteristics.Total sample Volumetry group (n = 82), vs. rest Semi-quantitative group (n = 139), vs. n = 246 of sample rest of sample Age, median (IQR) Women, n ( ) MMSE, median (IQR) Coronary heart disease, n 
( ) Hypertension (history of), n ( ) Diabetes mellitus, n ( ) APOEe4 1 allele, fractions ( ) Previous stroke, n ( ) Smoker (former/pres.), n ( ) Heart failure, n ( ) Orthos.Drops. Similarly, there were no significant differences between those in the highest and lowest Scheltens DWMH score quartiles with respect to the other variables in Table 2 (data not shown). In bivariate logistic regression analyses, diastolic BP drop, age and APOEe4 status achieved the lowest p-values (0.124, 0.117 and 0.094, respectively). Due to the rather small subsample, in combination with missing values for the relevant variables, it was not statistically feasible to perform multiple logistic regression analyses using these variables.Statistical AnalysesA total of 82 patients had MRI scans that could be analysed volumetrically (volumetry group), and 139 had scans that could be rated semi-quantitatively (the semi-quantitative group) according to the Scheltens scale. The scans of 61 patients were analysed with both methods, yielding a correlation coefficient (Spearman’s rho) of 0.791 (p,0.001) between the scores of the two methods. MannWhitney U-test, Chi-square, Spearman rank order or Fisher’s exact test were used as appropriate. None of the continuous variables 15481974 had a normal distribution, according to the KolmogorovSmirnov test. Potential predictor variables having p-values ,0.25 in bivariate logistic regression analyses were included in stepwise multiple logistic regression analyses, with the response variable defined as being in the highest quartile of total WMH volume ratios or Scheltens deep WMH (DWMH) scores vs. the lowest quartile, respectively. P-values ,0.05 (two-tailed) were considered statistically significant. All statistical tests were performed using PASW Statistics 18, release 18.0.1.ResultsWhen comparing the baseline characteristics of patients undergoing WMH volume analysis with those who were not included in the study, the only significant difference was a higher proportion with Alzheimer’s disease among the participants (volumetry group: Pearson Chi square 14.558, df 1, p,0.001, semi-quantitative group: Pearson Chi square 8.162, df 1, p = 0.006 (Table 1)). In the volumetry group, the only significant difference with respect to relevant clinical characteristics between patients in the highest and lowest WMH quartiles was a lower proportion in the former group with at least one APOEe4 allele (Table 2). In the semi-quantitative group, patients in the highest DWMH score quartile were significantly older than those in the lowest quartile, and the proportion of patients with a previous stroke was significantly higher in the highest quartile. Otherwise, there wereDiscussionThe main finding of our study is that in this sample of older people with mild dementia, WMH were not associated with OH or low standing systolic BP. Only APOEe4 status (volumetry) and age (volumetry and semi-quantitative analysis) were independently associated with WMH volumes. Thus, our hypothesis that WMH in mild dementia are associated with OH was not supported. This finding is in contrast to some previous studies. However, 12926553 some of these studies were performed in older people with major depression [16,18,19],OH and WMH in Mild DementiaTable 1. Demographic and clinical characteristics.Total sample Volumetry group (n = 82), vs. rest Semi-quantitative group (n = 139), vs. n = 246 of sample rest of sample Age, median (IQR) Women, n ( ) MMSE, median (IQR) Coronary heart disease, n ( ) Hypertension (history of), n ( ) Diabetes mellitus, n ( ) APOEe4 1 allele, fractions ( ) Previous stroke, n ( ) Smoker (former/pres.), n ( ) Heart failure, n ( ) Orthos.
