condition mean min max ZT0-3 3197.909952 3197.909952 3197.909952 ZT4-7 3174.1834745 3174.1834745 3174.1834745 ZT8-11 3880.0740735 3880.0740735 3880.0740735 ZT12-15 3634.321486 3634.321486 3634.321486 ZT16-19 5004.4003505 5004.4003505 5004.4003505 ZT20-23 5354.622856 5354.622856 5354.622856