condition mean min max ZT0-3 226.9 226.9 226.9 ZT4-7 238.6 238.6 238.6 ZT8-11 228.35 228.35 228.35 ZT12-15 279.55 279.55 279.55 ZT16-19 291.75 291.75 291.75 ZT20-23 316.85 316.85 316.85