condition mean min max ZT0-3 3.9857075 3.959125 4.01229 ZT4-7 3.5975650000000003 3.5975650000000003 3.5975650000000003 ZT8-11 3.858315 3.858315 3.858315 ZT12-15 0 0 0 ZT16-19 4.2703 4.2703 4.2703 ZT20-23 4.64035 4.64035 4.64035