condition mean min max ZT0-3 26.602398135 12.71126846 40.49352781 ZT4-7 41.9009691125 41.27699246 42.524945765 ZT8-11 44.832059637499995 42.607601855 47.05651742 ZT12-15 35.3831872275 33.754710595 37.01166386 ZT16-19 37.138393105000006 36.575383205 37.701403005 ZT20-23 37.5903449775 36.044868475 39.135821480000004