condition mean min max ZT0-3 19.12534 19.12534 19.12534 ZT4-7 22.6965255 22.6965255 22.6965255 ZT8-11 24.265377 24.265377 24.265377 ZT12-15 17.2279715 17.2279715 17.2279715 ZT16-19 17.433964500000002 17.433964500000002 17.433964500000002 ZT20-23 14.722069999999999 14.722069999999999 14.722069999999999