condition mean min max ZT0-3 0.3862891666666667 0.17054249999999999 0.7803465 ZT4-7 1.44874 1.44874 1.44874 ZT8-11 3.620075 3.620075 3.620075 ZT12-15 1.7136775 1.395025 2.03233 ZT16-19 0.9118325 0.9118325 0.9118325 ZT20-23 0.398996 0.398996 0.398996