condition mean min max ZT0-3 871.0 871.0 871.0 ZT4-7 572.3 572.3 572.3 ZT8-11 644.8 644.8 644.8 ZT12-15 568.6 568.6 568.6 ZT16-19 911.2 911.2 911.2 ZT20-23 1194.3000000000002 1194.3000000000002 1194.3000000000002