condition mean min max ZT0-3 13.808200000000001 11.0093 16.607100000000003 ZT4-7 11.057205 11.057205 11.057205 ZT8-11 9.88637 9.88637 9.88637 ZT12-15 0 0 0 ZT16-19 20.53915 20.53915 20.53915 ZT20-23 21.3896 21.3896 21.3896