condition mean min max ZT0-3 1044.37073 1044.37073 1044.37073 ZT4-7 871.6343865 871.6343865 871.6343865 ZT8-11 925.8362215 925.8362215 925.8362215 ZT12-15 1070.30416 1070.30416 1070.30416 ZT16-19 941.534699 941.534699 941.534699 ZT20-23 1145.3447635 1145.3447635 1145.3447635