condition mean min max ZT0-3 244.600495 244.600495 244.600495 ZT4-7 282.427298 282.427298 282.427298 ZT8-11 316.2920705 316.2920705 316.2920705 ZT12-15 272.0660775 272.0660775 272.0660775 ZT16-19 260.316327 260.316327 260.316327 ZT20-23 248.80742800000002 248.80742800000002 248.80742800000002