condition mean min max ZT0-3 44.358618 44.358618 44.358618 ZT4-7 25.602144 25.602144 25.602144 ZT8-11 31.602636 31.602636 31.602636 ZT12-15 43.828584 43.828584 43.828584 ZT16-19 50.492262999999994 50.492262999999994 50.492262999999994 ZT20-23 58.669703500000004 58.669703500000004 58.669703500000004