condition mean min max ZT0-3 15.164775 14.792100000000001 15.53745 ZT4-7 16.6069 16.6069 16.6069 ZT8-11 20.3781 20.3781 20.3781 ZT12-15 0 0 0 ZT16-19 22.3194 22.3194 22.3194 ZT20-23 20.485799999999998 20.485799999999998 20.485799999999998