condition mean min max ZT0-3 5.02156 4.94604 5.09708 ZT4-7 2.994725 2.994725 2.994725 ZT8-11 2.194955 2.194955 2.194955 ZT12-15 0 0 0 ZT16-19 4.08875 4.08875 4.08875 ZT20-23 4.49223 4.49223 4.49223