condition mean min max ZT0-3 333.078211 333.078211 333.078211 ZT4-7 403.2457495 403.2457495 403.2457495 ZT8-11 347.126103 347.126103 347.126103 ZT12-15 203.44366100000002 203.44366100000002 203.44366100000002 ZT16-19 259.71583 259.71583 259.71583 ZT20-23 305.741094 305.741094 305.741094