condition mean min max ZT0-3 377.331974 377.331974 377.331974 ZT4-7 358.55715399999997 358.55715399999997 358.55715399999997 ZT8-11 264.18658949999997 264.18658949999997 264.18658949999997 ZT12-15 312.7726515 312.7726515 312.7726515 ZT16-19 343.4537675 343.4537675 343.4537675 ZT20-23 374.005469 374.005469 374.005469