condition mean min max ZT0-3 58.703725000000006 43.44045 73.96700000000001 ZT4-7 13.24245 13.24245 13.24245 ZT8-11 13.1417 13.1417 13.1417 ZT12-15 0 0 0 ZT16-19 31.26475 31.26475 31.26475 ZT20-23 26.27065 26.27065 26.27065