condition mean min max ZT0-3 11.291713 11.291713 11.291713 ZT4-7 11.1855795 11.1855795 11.1855795 ZT8-11 10.537075999999999 10.537075999999999 10.537075999999999 ZT12-15 10.375388999999998 10.375388999999998 10.375388999999998 ZT16-19 9.711261 9.711261 9.711261 ZT20-23 12.4284725 12.4284725 12.4284725