condition mean min max ZT0-3 14.020065 14.020065 14.020065 ZT4-7 19.852548 19.852548 19.852548 ZT8-11 17.151147 17.151147 17.151147 ZT12-15 17.0485105 17.0485105 17.0485105 ZT16-19 18.835141 18.835141 18.835141 ZT20-23 20.0138465 20.0138465 20.0138465