condition mean min max ZT0-3 7.76243 6.4354499999999994 9.08941 ZT4-7 37.75775 37.75775 37.75775 ZT8-11 14.1204 14.1204 14.1204 ZT12-15 0 0 0 ZT16-19 10.67535 10.67535 10.67535 ZT20-23 20.69495 20.69495 20.69495