condition mean min max ZT0-3 37.853075000000004 34.26885 41.4373 ZT4-7 18.6829 18.6829 18.6829 ZT8-11 14.27185 14.27185 14.27185 ZT12-15 0 0 0 ZT16-19 33.614599999999996 33.614599999999996 33.614599999999996 ZT20-23 34.1719 34.1719 34.1719