condition mean min max ZT0-3 0.2934184666666667 0.1701429 0.375333 ZT4-7 0.17967265 0.17967265 0.17967265 ZT8-11 0.46387999999999996 0.46387999999999996 0.46387999999999996 ZT12-15 0.73293125 0.665979 0.7998835 ZT16-19 0.812771 0.812771 0.812771 ZT20-23 0.7877689999999999 0.7877689999999999 0.7877689999999999