condition mean min max ZT0-3 2542.5 2542.5 2542.5 ZT4-7 4432.3 4432.3 4432.3 ZT8-11 4821.55 4821.55 4821.55 ZT12-15 4851.65 4851.65 4851.65 ZT16-19 3670.7 3670.7 3670.7 ZT20-23 2970.7 2970.7 2970.7