condition mean min max ZT0-3 1371.906664 1371.906664 1371.906664 ZT4-7 1171.6984575000001 1171.6984575000001 1171.6984575000001 ZT8-11 791.099455 791.099455 791.099455 ZT12-15 677.566328 677.566328 677.566328 ZT16-19 913.909781 913.909781 913.909781 ZT20-23 1422.0849910000002 1422.0849910000002 1422.0849910000002