condition mean min max ZT0-3 4.24462 4.24462 4.24462 ZT4-7 3.233745 3.233745 3.233745 ZT8-11 2.366345 2.366345 2.366345 ZT12-15 4.7622800000000005 4.7622800000000005 4.7622800000000005 ZT16-19 6.27463 6.27463 6.27463 ZT20-23 5.99144 5.99144 5.99144