condition mean min max ZT0-3 24.1068 24.1068 24.1068 ZT4-7 21.15925 21.15925 21.15925 ZT8-11 18.875349999999997 18.875349999999997 18.875349999999997 ZT12-15 19.107300000000002 19.107300000000002 19.107300000000002 ZT16-19 23.2054 23.2054 23.2054 ZT20-23 25.883266666666668 25.883266666666668 25.883266666666668