condition mean min max ZT0-3 2.44395 2.44395 2.44395 ZT4-7 2.4290950000000002 2.4290950000000002 2.4290950000000002 ZT8-11 2.3274850000000002 2.3274850000000002 2.3274850000000002 ZT12-15 1.54712 1.54712 1.54712 ZT16-19 3.2272600000000002 3.2272600000000002 3.2272600000000002 ZT20-23 2.28848 2.28848 2.28848