condition mean min max ZT0-3 8.981185 6.62387 11.3385 ZT4-7 8.858419999999999 8.858419999999999 8.858419999999999 ZT8-11 8.455919999999999 8.455919999999999 8.455919999999999 ZT12-15 0 0 0 ZT16-19 15.634149999999998 15.634149999999998 15.634149999999998 ZT20-23 14.8481 14.8481 14.8481