condition mean min max ZT0-3 5.19825723125 5.088721443500001 5.307793019 ZT4-7 4.844064933833334 4.699077538 4.9890523296666665 ZT8-11 5.021637383666667 4.818108480333333 5.225166287 ZT12-15 4.8601051785 4.556865597 5.16334476 ZT16-19 4.562829061166667 4.4185265970000005 4.707131525333334 ZT20-23 5.7400956 4.710122083 6.770069116999999