condition mean min max ZT0-3 5.342415000000001 5.342415000000001 5.342415000000001 ZT4-7 3.706615 3.706615 3.706615 ZT8-11 3.27488 3.27488 3.27488 ZT12-15 4.395215 4.395215 4.395215 ZT16-19 5.009285 5.009285 5.009285 ZT20-23 5.38586 5.38586 5.38586