condition mean min max ZT0-3 362.95000000000005 362.95000000000005 362.95000000000005 ZT4-7 266.0 266.0 266.0 ZT8-11 240.1 240.1 240.1 ZT12-15 271.6 271.6 271.6 ZT16-19 476.59999999999997 476.59999999999997 476.59999999999997 ZT20-23 487.0 487.0 487.0