condition mean min max ZT0-3 137.117108 137.117108 137.117108 ZT4-7 91.5011175 91.5011175 91.5011175 ZT8-11 114.958782 114.958782 114.958782 ZT12-15 94.722126 94.722126 94.722126 ZT16-19 157.6688565 157.6688565 157.6688565 ZT20-23 122.378925 122.378925 122.378925