condition mean min max ZT0-3 8.736094999999999 8.64146 8.830729999999999 ZT4-7 7.746354999999999 7.746354999999999 7.746354999999999 ZT8-11 9.41055 9.41055 9.41055 ZT12-15 0 0 0 ZT16-19 11.462250000000001 11.462250000000001 11.462250000000001 ZT20-23 9.8147 9.8147 9.8147