condition mean min max ZT0-3 11.27322 11.27322 11.27322 ZT4-7 11.191572 11.191572 11.191572 ZT8-11 10.344263 10.344263 10.344263 ZT12-15 10.1026855 10.1026855 10.1026855 ZT16-19 9.901731999999999 9.901731999999999 9.901731999999999 ZT20-23 11.335119 11.335119 11.335119