condition mean min max ZT0-3 13.156375 12.11535 14.1974 ZT4-7 10.21674 10.21674 10.21674 ZT8-11 11.6147 11.6147 11.6147 ZT12-15 0 0 0 ZT16-19 12.72785 12.72785 12.72785 ZT20-23 11.6723 11.6723 11.6723