condition mean min max ZT0-3 9.78544 8.61628 10.9546 ZT4-7 8.592485 8.592485 8.592485 ZT8-11 10.402940000000001 10.402940000000001 10.402940000000001 ZT12-15 0 0 0 ZT16-19 10.292065000000001 10.292065000000001 10.292065000000001 ZT20-23 8.84141 8.84141 8.84141