condition mean min max ZT0-3 0.97440425 0.7550735 1.193735 ZT4-7 1.922215 1.922215 1.922215 ZT8-11 8.626795 8.626795 8.626795 ZT12-15 0 0 0 ZT16-19 6.80412 6.80412 6.80412 ZT20-23 3.40648 3.40648 3.40648