condition mean min max ZT0-3 385.144981 385.144981 385.144981 ZT4-7 409.0592145 409.0592145 409.0592145 ZT8-11 343.16265450000003 343.16265450000003 343.16265450000003 ZT12-15 255.0137965 255.0137965 255.0137965 ZT16-19 375.90251 375.90251 375.90251 ZT20-23 464.1088625 464.1088625 464.1088625