condition mean min max ZT0-3 149.356208 149.356208 149.356208 ZT4-7 225.958614 225.958614 225.958614 ZT8-11 237.04866900000002 237.04866900000002 237.04866900000002 ZT12-15 172.61217449999998 172.61217449999998 172.61217449999998 ZT16-19 157.95457599999997 157.95457599999997 157.95457599999997 ZT20-23 167.3831355 167.3831355 167.3831355