condition mean min max ZT0-3 1814.786038 1814.786038 1814.786038 ZT4-7 2595.4694835 2595.4694835 2595.4694835 ZT8-11 1025.7360055 1025.7360055 1025.7360055 ZT12-15 831.6744980000001 831.6744980000001 831.6744980000001 ZT16-19 2255.8130885 2255.8130885 2255.8130885 ZT20-23 4072.6909765 4072.6909765 4072.6909765