condition mean min max ZT0-3 718.807958 718.807958 718.807958 ZT4-7 819.6426855 819.6426855 819.6426855 ZT8-11 1000.46595 1000.46595 1000.46595 ZT12-15 801.5539885000001 801.5539885000001 801.5539885000001 ZT16-19 1210.8146895 1210.8146895 1210.8146895 ZT20-23 1119.0278455 1119.0278455 1119.0278455