condition mean min max ZT0-3 698.836183 698.836183 698.836183 ZT4-7 505.5923015 505.5923015 505.5923015 ZT8-11 423.8590315 423.8590315 423.8590315 ZT12-15 617.7940975 617.7940975 617.7940975 ZT16-19 317.11569599999996 317.11569599999996 317.11569599999996 ZT20-23 619.119944 619.119944 619.119944