condition mean min max ZT0-3 30.841025000000002 27.4997 34.18235 ZT4-7 19.215049999999998 19.215049999999998 19.215049999999998 ZT8-11 19.20895 19.20895 19.20895 ZT12-15 0 0 0 ZT16-19 22.5427 22.5427 22.5427 ZT20-23 26.140500000000003 26.140500000000003 26.140500000000003