condition mean min max ZT0-3 16.383733333333332 16.383733333333332 16.383733333333332 ZT4-7 16.631349999999998 16.631349999999998 16.631349999999998 ZT8-11 11.035835 11.035835 11.035835 ZT12-15 12.54245 12.54245 12.54245 ZT16-19 12.61958 12.61958 12.61958 ZT20-23 15.658900000000001 15.658900000000001 15.658900000000001