condition mean min max ZT0-3 0.21013358333333332 0.10910225 0.2680035 ZT4-7 0.13429825 0.13429825 0.13429825 ZT8-11 0.1859715 0.1859715 0.1859715 ZT12-15 0.7346202500000001 0.42553549999999996 1.043705 ZT16-19 0.41513 0.41513 0.41513 ZT20-23 0.46521100000000004 0.46521100000000004 0.46521100000000004