condition mean min max ZT0-3 11.67975 11.54705 11.81245 ZT4-7 14.82625 14.82625 14.82625 ZT8-11 13.5368 13.5368 13.5368 ZT12-15 0 0 0 ZT16-19 14.85685 14.85685 14.85685 ZT20-23 16.28785 16.28785 16.28785