condition mean min max ZT0-3 2.4874074999999998 2.347245 2.62757 ZT4-7 5.97153 5.97153 5.97153 ZT8-11 11.06215 11.06215 11.06215 ZT12-15 0 0 0 ZT16-19 7.315060000000001 7.315060000000001 7.315060000000001 ZT20-23 5.32787 5.32787 5.32787