condition mean min max ZT0-3 846.869353 846.869353 846.869353 ZT4-7 979.385464 979.385464 979.385464 ZT8-11 909.8456 909.8456 909.8456 ZT12-15 972.4028209999999 972.4028209999999 972.4028209999999 ZT16-19 810.797497 810.797497 810.797497 ZT20-23 929.1605595 929.1605595 929.1605595