condition mean min max ZT0-3 0.7631995 0.429303 1.097096 ZT4-7 0.9446755 0.9446755 0.9446755 ZT8-11 1.46022 1.46022 1.46022 ZT12-15 0 0 0 ZT16-19 1.3499189999999999 1.3499189999999999 1.3499189999999999 ZT20-23 1.6928800000000002 1.6928800000000002 1.6928800000000002