condition mean min max ZT0-3 11.064358333333335 8.877075000000001 13.155100000000001 ZT4-7 14.8797 14.8797 14.8797 ZT8-11 12.77135 12.77135 12.77135 ZT12-15 24.4043 23.577849999999998 25.23075 ZT16-19 25.20195 25.20195 25.20195 ZT20-23 21.2728 21.2728 21.2728