condition mean min max ZT0-3 0.299699 0.255009 0.344389 ZT4-7 0.2240525 0.2240525 0.2240525 ZT8-11 0.3169765 0.3169765 0.3169765 ZT12-15 0 0 0 ZT16-19 0.7520885 0.7520885 0.7520885 ZT20-23 0.3147885 0.3147885 0.3147885