condition mean min max ZT0-3 79.720327 79.720327 79.720327 ZT4-7 90.815117 90.815117 90.815117 ZT8-11 70.867088 70.867088 70.867088 ZT12-15 93.6985595 93.6985595 93.6985595 ZT16-19 55.56228900000001 55.56228900000001 55.56228900000001 ZT20-23 74.701849 74.701849 74.701849