condition mean min max ZT0-3 1.3816 1.3816 1.3816 ZT4-7 0.8504484999999999 0.8504484999999999 0.8504484999999999 ZT8-11 0.634496 0.634496 0.634496 ZT12-15 0.762886 0.762886 0.762886 ZT16-19 1.133745 1.133745 1.133745 ZT20-23 1.135 1.135 1.135