condition mean min max ZT0-3 0.7857435822500001 0.57533908 0.9961480845 ZT4-7 2.54262367875 2.2373717135 2.847875644 ZT8-11 11.521748162 5.089230539 17.954265785 ZT12-15 22.6626577275 21.603998775 23.72131668 ZT16-19 10.733563426 7.417380892 14.049745960000001 ZT20-23 4.20389716625 3.7464594900000003 4.6613348425000005