condition mean min max ZT0-3 31.141349999999996 31.141349999999996 31.141349999999996 ZT4-7 22.78135 22.78135 22.78135 ZT8-11 49.7114 49.7114 49.7114 ZT12-15 41.116 41.116 41.116 ZT16-19 24.81335 24.81335 24.81335 ZT20-23 22.980600000000003 22.980600000000003 22.980600000000003