condition mean min max ZT0-3 52.324295 52.324295 52.324295 ZT4-7 54.616252 54.616252 54.616252 ZT8-11 50.765119999999996 50.765119999999996 50.765119999999996 ZT12-15 52.959555 52.959555 52.959555 ZT16-19 47.553508 47.553508 47.553508 ZT20-23 52.393594 52.393594 52.393594