condition mean min max ZT0-3 267.79999999999995 267.79999999999995 267.79999999999995 ZT4-7 389.4 389.4 389.4 ZT8-11 312.75 312.75 312.75 ZT12-15 208.6 208.6 208.6 ZT16-19 263.05 263.05 263.05 ZT20-23 242.0 242.0 242.0