condition mean min max ZT0-3 14.175371 14.175371 14.175371 ZT4-7 10.82488 10.82488 10.82488 ZT8-11 8.876074 8.876074 8.876074 ZT12-15 10.291405000000001 10.291405000000001 10.291405000000001 ZT16-19 10.205799 10.205799 10.205799 ZT20-23 9.8925685 9.8925685 9.8925685