condition mean min max ZT0-3 32.54835 29.217399999999998 35.8793 ZT4-7 26.27385 26.27385 26.27385 ZT8-11 16.6278 16.6278 16.6278 ZT12-15 0 0 0 ZT16-19 18.0973 18.0973 18.0973 ZT20-23 24.98505 24.98505 24.98505