condition mean min max ZT0-3 9.57674510975 9.5208818405 9.632608379 ZT4-7 19.0528647775 15.099282105 23.006447450000003 ZT8-11 22.6533286075 21.340740555 23.965916659999998 ZT12-15 19.948851207500002 18.993176615000003 20.904525800000002 ZT16-19 32.522915582500005 26.624001685000003 38.42182948 ZT20-23 52.871141734999995 51.30330334 54.43898013