condition mean min max ZT0-3 11.4 11.4 11.4 ZT4-7 7.9 7.9 7.9 ZT8-11 48.25 48.25 48.25 ZT12-15 84.95 84.95 84.95 ZT16-19 13.65 13.65 13.65 ZT20-23 40.2 40.2 40.2