condition mean min max ZT0-3 34.129199 34.129199 34.129199 ZT4-7 38.049055499999994 38.049055499999994 38.049055499999994 ZT8-11 32.0732545 32.0732545 32.0732545 ZT12-15 29.581722 29.581722 29.581722 ZT16-19 30.81049 30.81049 30.81049 ZT20-23 36.5595835 36.5595835 36.5595835