condition mean min max ZT0-3 90.65719999999999 85.20384999999999 96.11055 ZT4-7 59.810900000000004 59.810900000000004 59.810900000000004 ZT8-11 51.46 51.46 51.46 ZT12-15 0 0 0 ZT16-19 121.2886 121.2886 121.2886 ZT20-23 87.22235 87.22235 87.22235