condition mean min max ZT0-3 851.973736 851.973736 851.973736 ZT4-7 250.08721 250.08721 250.08721 ZT8-11 209.875666 209.875666 209.875666 ZT12-15 388.6901235 388.6901235 388.6901235 ZT16-19 917.4896565 917.4896565 917.4896565 ZT20-23 854.6670039999999 854.6670039999999 854.6670039999999