condition mean min max ZT0-3 3941.05 3941.05 3941.05 ZT4-7 3141.9 3141.9 3141.9 ZT8-11 3092.3 3092.3 3092.3 ZT12-15 3277.9 3277.9 3277.9 ZT16-19 3502.1499999999996 3502.1499999999996 3502.1499999999996 ZT20-23 3812.65 3812.65 3812.65