condition mean min max ZT0-3 7.049375 7.049375 7.049375 ZT4-7 10.739163333333334 10.739163333333334 10.739163333333334 ZT8-11 12.082862500000001 12.082862500000001 12.082862500000001 ZT12-15 11.07964 11.07964 11.07964 ZT16-19 9.5511725 9.5511725 9.5511725 ZT20-23 8.86401 8.86401 8.86401