condition mean min max ZT0-3 140.052353 140.052353 140.052353 ZT4-7 157.9101705 157.9101705 157.9101705 ZT8-11 152.738358 152.738358 152.738358 ZT12-15 139.925368 139.925368 139.925368 ZT16-19 149.1428325 149.1428325 149.1428325 ZT20-23 149.48955999999998 149.48955999999998 149.48955999999998