condition mean min max ZT0-3 1.1830263333333333 0.165744 1.935175 ZT4-7 0.9744145 0.9744145 0.9744145 ZT8-11 2.471715 2.471715 2.471715 ZT12-15 1.030665 0.9963075000000001 1.0650225 ZT16-19 1.5375100000000002 1.5375100000000002 1.5375100000000002 ZT20-23 1.0170270000000001 1.0170270000000001 1.0170270000000001