condition mean min max ZT0-3 13.844453 13.844453 13.844453 ZT4-7 14.443328 14.443328 14.443328 ZT8-11 13.60618 13.60618 13.60618 ZT12-15 14.6218645 14.6218645 14.6218645 ZT16-19 14.409034 14.409034 14.409034 ZT20-23 15.663836 15.663836 15.663836