condition mean min max ZT0-3 179.5 179.5 179.5 ZT4-7 134.7 134.7 134.7 ZT8-11 139.0 139.0 139.0 ZT12-15 117.55000000000001 117.55000000000001 117.55000000000001 ZT16-19 173.6 173.6 173.6 ZT20-23 197.4 197.4 197.4