condition mean min max ZT0-3 12.758844 12.758844 12.758844 ZT4-7 12.838946499999999 12.838946499999999 12.838946499999999 ZT8-11 12.245054 12.245054 12.245054 ZT12-15 11.8339095 11.8339095 11.8339095 ZT16-19 12.891467 12.891467 12.891467 ZT20-23 11.2535525 11.2535525 11.2535525