condition mean min max ZT0-3 649.3499999999999 649.3499999999999 649.3499999999999 ZT4-7 592.3 592.3 592.3 ZT8-11 578.5 578.5 578.5 ZT12-15 536.9 536.9 536.9 ZT16-19 552.2 552.2 552.2 ZT20-23 652.7 652.7 652.7