condition mean min max ZT0-3 179.093414 179.093414 179.093414 ZT4-7 148.7262455 148.7262455 148.7262455 ZT8-11 145.582576 145.582576 145.582576 ZT12-15 131.3259715 131.3259715 131.3259715 ZT16-19 141.285193 141.285193 141.285193 ZT20-23 146.0422785 146.0422785 146.0422785