condition mean min max ZT0-3 1.2818358115000001 1.179723206 1.383948417 ZT4-7 1.2201789399999998 0.8424320395 1.5979258404999999 ZT8-11 3.2113880225 2.3656010370000002 4.057175008 ZT12-15 3.2895717374999998 2.6137429694999996 3.9654005055 ZT16-19 2.7622933275 2.5739311135 2.9506555414999998 ZT20-23 3.64283068125 3.377646094 3.9080152685