condition mean min max ZT0-3 140.652475055 63.247714810000005 218.0572353 ZT4-7 34.372012712499995 28.515216175 40.22880925 ZT8-11 94.7249965625 73.207752295 116.24224083 ZT12-15 55.6832747225 29.775787180000002 81.590762265 ZT16-19 20.0459164125 17.282750444999998 22.80908238 ZT20-23 13.23262249 12.877400705 13.587844275000002