condition mean min max ZT0-3 12.944109 12.944109 12.944109 ZT4-7 22.562946 22.562946 22.562946 ZT8-11 23.924108500000003 23.924108500000003 23.924108500000003 ZT12-15 20.4287925 20.4287925 20.4287925 ZT16-19 21.1235965 21.1235965 21.1235965 ZT20-23 22.5782915 22.5782915 22.5782915