condition mean min max ZT0-3 243.738708 243.738708 243.738708 ZT4-7 185.47781550000002 185.47781550000002 185.47781550000002 ZT8-11 200.1900415 200.1900415 200.1900415 ZT12-15 263.55807949999996 263.55807949999996 263.55807949999996 ZT16-19 375.234442 375.234442 375.234442 ZT20-23 408.1360275 408.1360275 408.1360275