condition mean min max ZT0-3 623.5 623.5 623.5 ZT4-7 252.2 252.2 252.2 ZT8-11 382.9 382.9 382.9 ZT12-15 428.0 428.0 428.0 ZT16-19 542.05 542.05 542.05 ZT20-23 454.45 454.45 454.45