condition mean min max ZT0-3 48.46745 48.46745 48.46745 ZT4-7 31.958000000000002 31.958000000000002 31.958000000000002 ZT8-11 26.562800000000003 26.562800000000003 26.562800000000003 ZT12-15 38.1983 38.1983 38.1983 ZT16-19 47.9548 47.9548 47.9548 ZT20-23 68.1185 68.1185 68.1185