condition mean min max ZT0-3 4263.172607 4263.172607 4263.172607 ZT4-7 3367.775333 3367.775333 3367.775333 ZT8-11 3649.7337665 3649.7337665 3649.7337665 ZT12-15 4067.439923 4067.439923 4067.439923 ZT16-19 3808.770001 3808.770001 3808.770001 ZT20-23 3661.5500465 3661.5500465 3661.5500465