condition mean min max ZT0-3 176.4 176.4 176.4 ZT4-7 396.7 396.7 396.7 ZT8-11 362.5 362.5 362.5 ZT12-15 272.7 272.7 272.7 ZT16-19 228.10000000000002 228.10000000000002 228.10000000000002 ZT20-23 208.9 208.9 208.9