condition mean min max ZT0-3 0.17750683333333334 0.064321 0.40216799999999997 ZT4-7 0.19375900000000001 0.19375900000000001 0.19375900000000001 ZT8-11 0.729933 0.729933 0.729933 ZT12-15 0.37233025 0.210212 0.5344485 ZT16-19 0.064159 0.064159 0.064159 ZT20-23 0.072346 0.072346 0.072346