condition mean min max ZT0-3 316.775335 316.775335 316.775335 ZT4-7 217.63162599999998 217.63162599999998 217.63162599999998 ZT8-11 168.111254 168.111254 168.111254 ZT12-15 136.608538 136.608538 136.608538 ZT16-19 140.828665 140.828665 140.828665 ZT20-23 170.7430245 170.7430245 170.7430245