condition mean min max ZT0-3 21.251175 20.33685 22.1655 ZT4-7 25.047 25.047 25.047 ZT8-11 44.321600000000004 44.321600000000004 44.321600000000004 ZT12-15 0 0 0 ZT16-19 39.246300000000005 39.246300000000005 39.246300000000005 ZT20-23 26.89725 26.89725 26.89725