To study the all-cause mortality among men of elderly and senile age depending on day of week, month of year, a season, changing to daylight saving time, prospective supervision over 1067 men of 60 years and upward for a 13-year period was conducted. The all-cause mortality depending on transition into daylight saving time was counted for March and October and compared to indicators of April and November accordingly. The all-cause mortality rate had made 1668,5 on 1000. This indicator in January (177.9 per 1000) and August (175.2 per 1000) was higher, than in November (102.4 per 1000; p < 0.05). Dependence of all-cause mortality rate on day of week, a season, changing to daylight saving time was not revealed. The analysis of all-cause mortality rate on days of week in various seasons has revealed that in autumn the greatest all-cause mortality rate was observed on Sunday (83.6 per 1000), the least--on Monday (35.0 per 1000). Besides, on Monday the greatest all-cause mortality rate was observed in winter (35.5%, or 72.8 per 1000), and the least one--in autumn (17.1%, or 35.0 per 1000). During other moments of supervision statically significant distinctions were not revealed.

The survival rate of 724 men of 60 years and upward in dependence of duration QT corrected interval was studied. To smooth the age influence on survival rate, the groups with various QTc values were leveled by age. The survival rate (Kaplan-Meier) analysis was made among 228 persons. Men aged 60 years and upward were not observed the prolongation of OTc with age increase. The survival rate of these men depended on QTc duration: if QTc was 380-409 ms the survival rate was better than in cases OTc > or = 410 ms (p < 0.006). The relative risk of a fatal outcome in men with QTc duration > or = 410 ms was 1,6 times more than in men with QTc duration 380-409 ms (95 % CI 1.1-2.3).