condition mean min max ZT0-3 989.9000000000001 989.9000000000001 989.9000000000001 ZT4-7 2430.9 2430.9 2430.9 ZT8-11 1848.6000000000001 1848.6000000000001 1848.6000000000001 ZT12-15 941.5 941.5 941.5 ZT16-19 502.54999999999995 502.54999999999995 502.54999999999995 ZT20-23 530.6 530.6 530.6