condition mean min max ZT0-3 9.138912 9.138912 9.138912 ZT4-7 10.422140500000001 10.422140500000001 10.422140500000001 ZT8-11 10.238002999999999 10.238002999999999 10.238002999999999 ZT12-15 8.618300999999999 8.618300999999999 8.618300999999999 ZT16-19 8.939673500000001 8.939673500000001 8.939673500000001 ZT20-23 9.4020705 9.4020705 9.4020705