condition mean min max ZT0-3 330.4465 330.4465 330.4465 ZT4-7 274.3225 274.3225 274.3225 ZT8-11 226.67000000000002 226.67000000000002 226.67000000000002 ZT12-15 253.4885 253.4885 253.4885 ZT16-19 301.04949999999997 301.04949999999997 301.04949999999997 ZT20-23 341.0825 341.0825 341.0825