condition mean min max ZT0-3 165.684292 165.684292 165.684292 ZT4-7 147.24935 147.24935 147.24935 ZT8-11 136.98894 136.98894 136.98894 ZT12-15 136.4669615 136.4669615 136.4669615 ZT16-19 160.3229925 160.3229925 160.3229925 ZT20-23 159.2705185 159.2705185 159.2705185