condition mean min max ZT0-3 2.75284 2.75284 2.75284 ZT4-7 1.514435 1.514435 1.514435 ZT8-11 1.56958 1.56958 1.56958 ZT12-15 1.7454749999999999 1.7454749999999999 1.7454749999999999 ZT16-19 3.955125 3.955125 3.955125 ZT20-23 3.091925 3.091925 3.091925