condition mean min max ZT0-3 166.078211 166.078211 166.078211 ZT4-7 168.5545965 168.5545965 168.5545965 ZT8-11 633.04351 633.04351 633.04351 ZT12-15 482.01779150000004 482.01779150000004 482.01779150000004 ZT16-19 719.645527 719.645527 719.645527 ZT20-23 772.9126845 772.9126845 772.9126845