condition mean min max ZT0-3 310.810435 310.810435 310.810435 ZT4-7 179.808849 179.808849 179.808849 ZT8-11 141.558692 141.558692 141.558692 ZT12-15 128.302149 128.302149 128.302149 ZT16-19 224.178676 224.178676 224.178676 ZT20-23 226.068858 226.068858 226.068858