condition mean min max ZT0-3 13.853950000000001 13.853950000000001 13.853950000000001 ZT4-7 9.093119999999999 9.093119999999999 9.093119999999999 ZT8-11 11.957799999999999 11.957799999999999 11.957799999999999 ZT12-15 12.729849999999999 12.729849999999999 12.729849999999999 ZT16-19 19.411949999999997 19.411949999999997 19.411949999999997 ZT20-23 15.5337 15.5337 15.5337