condition mean min max ZT0-3 50.48246666666667 47.5968 52.61965 ZT4-7 39.4708 39.4708 39.4708 ZT8-11 45.31885 45.31885 45.31885 ZT12-15 54.44845 53.36255 55.53435 ZT16-19 55.900949999999995 55.900949999999995 55.900949999999995 ZT20-23 54.03935 54.03935 54.03935