condition mean min max ZT0-3 23.877625000000002 21.78455 25.9707 ZT4-7 21.26725 21.26725 21.26725 ZT8-11 39.9086 39.9086 39.9086 ZT12-15 0 0 0 ZT16-19 53.1304 53.1304 53.1304 ZT20-23 39.85995 39.85995 39.85995