condition mean min max ZT0-3 218.644816 218.644816 218.644816 ZT4-7 167.2281465 167.2281465 167.2281465 ZT8-11 189.03607449999998 189.03607449999998 189.03607449999998 ZT12-15 211.74657150000002 211.74657150000002 211.74657150000002 ZT16-19 275.511715 275.511715 275.511715 ZT20-23 261.336359 261.336359 261.336359