condition mean min max ZT0-3 476.6 476.6 476.6 ZT4-7 277.0 277.0 277.0 ZT8-11 274.35 274.35 274.35 ZT12-15 269.7 269.7 269.7 ZT16-19 450.85 450.85 450.85 ZT20-23 540.15 540.15 540.15