Calculating QT interval duration Count the number of squares from the beginning of the QRS complex to the end of the T wave. Multiply this number by 0.04 second. The normal range is 0.36 to 0.44 second, or 9 to 11 small squares wide.alculating QT interval duration Count the number of squares from the beginning of the QRS complex to the end of the T wave. Multiply this number by 0.04 second. The normal range is 0.36 to 0.44 second, or 9 to 11 small squares wide.
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Walnut Creek Financial Statistics: Median household income (per year) $71,642: Income change over time (increase since 1990) 51.56%: Sales tax: 8.25%: State income tax rate (highest bracket) 9.30%: State income tax rate (lowest bracket) 1.00%: Auto insurance premiums (average for the state) $821: Walnut Creek Housing: Median home price: $511,559: Home price gain (2-5 year gain) 14.73%: Walnut Creek Education: Colleges, universities and professional schools (within 30 miles) 50: Junior colleges and technical institutes (within 30 miles) 26: Walnut Creek Quality of Life: Personal crime risk (100 is national average, lower is better) 40