condition mean min max ZT0-3 398.486003 398.486003 398.486003 ZT4-7 340.773186 340.773186 340.773186 ZT8-11 387.98071649999997 387.98071649999997 387.98071649999997 ZT12-15 542.337941 542.337941 542.337941 ZT16-19 213.78126550000002 213.78126550000002 213.78126550000002 ZT20-23 294.503512 294.503512 294.503512