condition mean min max ZT0-3 0.7736135000000001 0.517351 1.1219205 ZT4-7 0.6174919999999999 0.6174919999999999 0.6174919999999999 ZT8-11 0.73027 0.73027 0.73027 ZT12-15 1.28051825 1.2296865000000001 1.33135 ZT16-19 1.177025 1.177025 1.177025 ZT20-23 0.9731805 0.9731805 0.9731805