condition mean min max ZT0-3 188.221255 188.221255 188.221255 ZT4-7 205.80462599999998 205.80462599999998 205.80462599999998 ZT8-11 198.54634149999998 198.54634149999998 198.54634149999998 ZT12-15 241.2386285 241.2386285 241.2386285 ZT16-19 338.391215 338.391215 338.391215 ZT20-23 285.1978725 285.1978725 285.1978725