condition mean min max ZT0-3 15.341971 15.341971 15.341971 ZT4-7 18.1237885 18.1237885 18.1237885 ZT8-11 15.998963 15.998963 15.998963 ZT12-15 14.090145 14.090145 14.090145 ZT16-19 18.078376 18.078376 18.078376 ZT20-23 18.0339965 18.0339965 18.0339965