condition mean min max ZT0-3 937.7 937.7 937.7 ZT4-7 1064.4 1064.4 1064.4 ZT8-11 951.6 951.6 951.6 ZT12-15 764.7 764.7 764.7 ZT16-19 849.4 849.4 849.4 ZT20-23 881.5 881.5 881.5