condition mean min max ZT0-3 698.618254 698.618254 698.618254 ZT4-7 621.85866 621.85866 621.85866 ZT8-11 686.6913265000001 686.6913265000001 686.6913265000001 ZT12-15 766.451994 766.451994 766.451994 ZT16-19 372.730957 372.730957 372.730957 ZT20-23 189.7935335 189.7935335 189.7935335