condition mean min max ZT0-3 10.57143 10.57143 10.57143 ZT4-7 11.783850000000001 11.783850000000001 11.783850000000001 ZT8-11 6.583394999999999 6.583394999999999 6.583394999999999 ZT12-15 2.5385 2.5385 2.5385 ZT16-19 3.011973333333333 3.011973333333333 3.011973333333333 ZT20-23 4.26898 4.26898 4.26898