condition mean min max ZT0-3 5.0299475000000005 4.996435 5.06346 ZT4-7 7.351395 7.351395 7.351395 ZT8-11 9.74339 9.74339 9.74339 ZT12-15 0 0 0 ZT16-19 10.61735 10.61735 10.61735 ZT20-23 10.22699 10.22699 10.22699