condition mean min max ZT0-3 1003.7 1003.7 1003.7 ZT4-7 1211.8 1211.8 1211.8 ZT8-11 1200.5 1200.5 1200.5 ZT12-15 1459.45 1459.45 1459.45 ZT16-19 1397.6999999999998 1397.6999999999998 1397.6999999999998 ZT20-23 1196.0500000000002 1196.0500000000002 1196.0500000000002