condition mean min max ZT0-3 546.500457 546.500457 546.500457 ZT4-7 846.7412915 846.7412915 846.7412915 ZT8-11 741.116672 741.116672 741.116672 ZT12-15 584.7847465 584.7847465 584.7847465 ZT16-19 339.2653275 339.2653275 339.2653275 ZT20-23 253.1853035 253.1853035 253.1853035