condition mean min max ZT0-3 0.8686370000000001 0.410854 1.3264200000000002 ZT4-7 0.2926335 0.2926335 0.2926335 ZT8-11 0.20603470000000002 0.20603470000000002 0.20603470000000002 ZT12-15 0 0 0 ZT16-19 0.4483475 0.4483475 0.4483475 ZT20-23 0.1634837 0.1634837 0.1634837