condition mean min max ZT0-3 0.796159209 0.5044346160000001 1.0878838020000001 ZT4-7 3.20960323225 2.8932128969999997 3.5259935675 ZT8-11 8.074922706750002 5.7513093115 10.398536102000001 ZT12-15 29.045798840000003 24.719084995 33.372512685000004 ZT16-19 28.79796511 27.272909915 30.323020305 ZT20-23 22.0385836075 20.03169786 24.045469355