condition mean min max ZT0-3 1.721275 1.33949 2.3245050000000003 ZT4-7 1.898263 1.898263 1.898263 ZT8-11 1.155435 1.155435 1.155435 ZT12-15 1.9659525 1.55517 2.376735 ZT16-19 3.894845 3.894845 3.894845 ZT20-23 4.766735 4.766735 4.766735