condition mean min max ZT0-3 24.460175 21.82535 27.095 ZT4-7 18.2456 18.2456 18.2456 ZT8-11 19.47215 19.47215 19.47215 ZT12-15 0 0 0 ZT16-19 18.780250000000002 18.780250000000002 18.780250000000002 ZT20-23 23.76735 23.76735 23.76735