condition mean min max ZT0-3 7.256208333333333 4.827014999999999 8.994455 ZT4-7 9.91209 9.91209 9.91209 ZT8-11 14.0928 14.0928 14.0928 ZT12-15 14.1507725 11.359494999999999 16.942050000000002 ZT16-19 15.6177 15.6177 15.6177 ZT20-23 13.3446 13.3446 13.3446