These 10 animal facts will amaze you. Color blindness is most often a genetic visual deficiency that limits the colors that an individual can detect. Most people with this condition don't only see in black and white. The colors affected are usually limited to green and red, which often appear as shades of tan or brown.hese 10 animal facts will amaze you. Color blindness is most often a genetic visual deficiency that limits the colors that an individual can detect. Most people with this condition don't only see in black and white. The colors affected are usually limited to green and red, which often appear as shades of tan or brown.
The duration of the QT-interval varies dependent upon how fast the heart is beating, but in normal healthy people, when the heart is beating 60 beats per minute, it is between 350 and 440 milliseconds.
Normal ranges for each of the ECG parameters were constructed by calculating. the 2.5th and 97.5th percentiles overall and by site, age, gender, and ethnicity. following current standards for establishing reference ranges for laboratory testing. values (5). The impact of site, gender, age, BMI, ethnicity, and time of day of ECG. acquisition on these ECG parameters was also assessed. In order to better determine which (if any) of the covariates listed might have a. meaningful impact on normal range, the endpoints were analyzed for statistical. significance.