condition mean min max ZT0-3 2.7083399999999997 2.7083399999999997 2.7083399999999997 ZT4-7 1.90983 1.90983 1.90983 ZT8-11 4.714835 4.714835 4.714835 ZT12-15 2.91664 2.91664 2.91664 ZT16-19 4.924295 4.924295 4.924295 ZT20-23 2.4815750000000003 2.4815750000000003 2.4815750000000003