condition mean min max ZT0-3 374.1 374.1 374.1 ZT4-7 557.5 557.5 557.5 ZT8-11 492.05 492.05 492.05 ZT12-15 454.65 454.65 454.65 ZT16-19 493.75 493.75 493.75 ZT20-23 359.4 359.4 359.4