condition mean min max ZT0-3 3.4762975000000003 2.7444550000000003 4.20814 ZT4-7 5.319665 5.319665 5.319665 ZT8-11 17.5438 17.5438 17.5438 ZT12-15 0 0 0 ZT16-19 16.38175 16.38175 16.38175 ZT20-23 10.00916 10.00916 10.00916