condition mean min max ZT0-3 0.87633275 0.8203564999999999 0.932309 ZT4-7 0.626097 0.626097 0.626097 ZT8-11 41.358450000000005 41.358450000000005 41.358450000000005 ZT12-15 0 0 0 ZT16-19 41.05575 41.05575 41.05575 ZT20-23 7.97971 7.97971 7.97971