condition mean min max ZT0-3 0.8811586666666666 0.8757064999999999 0.8888365 ZT4-7 1.1275395000000001 1.1275395000000001 1.1275395000000001 ZT8-11 0.4349705 0.4349705 0.4349705 ZT12-15 0.6228629999999999 0.30164599999999997 0.94408 ZT16-19 0.9999264999999999 0.9999264999999999 0.9999264999999999 ZT20-23 0.943031 0.943031 0.943031