ECGs were assessed for the following parameters: underlying rhythm, heart rate, PR interval, QRS duration and QTc time in milliseconds (ms). ECGs were considered abnormal in case of prolonged PR ...

Cheng, S. et al. Long-term outcomes in individuals with prolonged PR interval or first-degree atrioventricular block. JAMA 301, 2571–2577 (2009).

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Important The interval size of a frequency distribution depends on the data being analyzed and the goals of the analyst. The intervals must be mutually exclusive and exhaustive.

This study proposes a time-varying reliability-constrained uncertain sliding mode control to improve spacecraft attitude tracking under incomplete information, with uncertainties modeled as interval ...

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Fertility begins to gradually decrease at about age 35, with a more rapid decline around 37. Becoming pregnant later in life can include an increased risk of miscarriage, gestational diabetes, fetal ...