condition mean min max ZT0-3 40.295924 40.295924 40.295924 ZT4-7 29.7731205 29.7731205 29.7731205 ZT8-11 20.582095000000002 20.582095000000002 20.582095000000002 ZT12-15 27.3450785 27.3450785 27.3450785 ZT16-19 24.330579 24.330579 24.330579 ZT20-23 32.7951665 32.7951665 32.7951665