condition mean min max ZT0-3 0.3948818333333333 0.0 1.1846455 ZT4-7 0.385024 0.385024 0.385024 ZT8-11 0.391337 0.391337 0.391337 ZT12-15 1.4206585 0.432547 2.40877 ZT16-19 1.120164 1.120164 1.120164 ZT20-23 0.852425 0.852425 0.852425