condition mean min max ZT0-3 0.4327015 0.29002700000000003 0.575376 ZT4-7 0.5022435000000001 0.5022435000000001 0.5022435000000001 ZT8-11 0.1264625 0.1264625 0.1264625 ZT12-15 0 0 0 ZT16-19 0.693017 0.693017 0.693017 ZT20-23 0.743089 0.743089 0.743089