condition mean min max ZT0-3 322.291381 322.291381 322.291381 ZT4-7 347.092656 347.092656 347.092656 ZT8-11 381.119505 381.119505 381.119505 ZT12-15 399.833483 399.833483 399.833483 ZT16-19 361.6758145 361.6758145 361.6758145 ZT20-23 213.2907135 213.2907135 213.2907135