condition mean min max ZT0-3 274.101376 274.101376 274.101376 ZT4-7 210.78189350000002 210.78189350000002 210.78189350000002 ZT8-11 214.170392 214.170392 214.170392 ZT12-15 218.5862855 218.5862855 218.5862855 ZT16-19 224.0317715 224.0317715 224.0317715 ZT20-23 196.237854 196.237854 196.237854