condition mean min max ZT0-3 9.652315 9.58128 9.72335 ZT4-7 9.26871 9.26871 9.26871 ZT8-11 5.567399999999999 5.567399999999999 5.567399999999999 ZT12-15 0 0 0 ZT16-19 7.9468250000000005 7.9468250000000005 7.9468250000000005 ZT20-23 18.0288 18.0288 18.0288