condition mean min max ZT0-3 0.5378938715 0.19952567 0.876262073 ZT4-7 2.4157415752499998 1.7989682095 3.0325149409999996 ZT8-11 4.95608160925 4.076967651 5.8351955675 ZT12-15 9.6882335025 8.648626843999999 10.727840161 ZT16-19 10.59322725125 9.9691454125 11.21730909 ZT20-23 12.521359627499999 12.255335464999998 12.78738379