condition mean min max ZT0-3 32.41935 32.41935 32.41935 ZT4-7 6.398175 6.398175 6.398175 ZT8-11 6.3409949999999995 6.3409949999999995 6.3409949999999995 ZT12-15 51.772999999999996 51.772999999999996 51.772999999999996 ZT16-19 104.96700000000001 104.96700000000001 104.96700000000001 ZT20-23 78.0091 78.0091 78.0091