condition mean min max ZT0-3 0.5370985 0.5370985 0.5370985 ZT4-7 0.2623625 0.2623625 0.2623625 ZT8-11 0.4723585 0.4723585 0.4723585 ZT12-15 0.5346745 0.5346745 0.5346745 ZT16-19 0.6038 0.6038 0.6038 ZT20-23 0.577976 0.577976 0.577976