condition mean min max ZT0-3 167.858356 167.858356 167.858356 ZT4-7 230.51380999999998 230.51380999999998 230.51380999999998 ZT8-11 234.3925875 234.3925875 234.3925875 ZT12-15 196.4707875 196.4707875 196.4707875 ZT16-19 259.2275535 259.2275535 259.2275535 ZT20-23 233.5215895 233.5215895 233.5215895