condition mean min max ZT0-3 1.2448859777499999 0.782126102 1.7076458534999999 ZT4-7 1.6944511885 1.5469766105 1.8419257665 ZT8-11 1.253534621 1.0845575459999999 1.422511696 ZT12-15 2.11013077925 1.124896677 3.0953648815 ZT16-19 4.350207839 3.493239658 5.20717602 ZT20-23 10.98989636325 9.120009667 12.8597830595