condition mean min max ZT0-3 12.03515 12.03515 12.03515 ZT4-7 7.66353 7.66353 7.66353 ZT8-11 11.942450000000001 11.942450000000001 11.942450000000001 ZT12-15 10.21621 10.21621 10.21621 ZT16-19 17.39995 17.39995 17.39995 ZT20-23 15.25465 15.25465 15.25465