condition mean min max ZT0-3 793.5 793.5 793.5 ZT4-7 592.1 592.1 592.1 ZT8-11 580.55 580.55 580.55 ZT12-15 724.4000000000001 724.4000000000001 724.4000000000001 ZT16-19 858.25 858.25 858.25 ZT20-23 913.3499999999999 913.3499999999999 913.3499999999999