condition mean min max ZT0-3 3.14346 2.63783 3.64909 ZT4-7 9.728159999999999 9.728159999999999 9.728159999999999 ZT8-11 5.60617 5.60617 5.60617 ZT12-15 0 0 0 ZT16-19 6.463865 6.463865 6.463865 ZT20-23 6.981114999999999 6.981114999999999 6.981114999999999