condition mean min max ZT0-3 13.15152 10.05476 16.1173 ZT4-7 8.136855 8.136855 8.136855 ZT8-11 13.242049999999999 13.242049999999999 13.242049999999999 ZT12-15 15.3129 13.71995 16.90585 ZT16-19 16.4452 16.4452 16.4452 ZT20-23 18.69905 18.69905 18.69905