condition mean min max ZT0-3 10.427593333333334 6.66233 13.020050000000001 ZT4-7 8.3589 8.3589 8.3589 ZT8-11 7.24376 7.24376 7.24376 ZT12-15 9.0565925 8.961635000000001 9.15155 ZT16-19 10.703199999999999 10.703199999999999 10.703199999999999 ZT20-23 13.008700000000001 13.008700000000001 13.008700000000001