condition mean min max ZT0-3 47.759118 47.759118 47.759118 ZT4-7 44.5876755 44.5876755 44.5876755 ZT8-11 49.500849 49.500849 49.500849 ZT12-15 38.8676545 38.8676545 38.8676545 ZT16-19 35.8283135 35.8283135 35.8283135 ZT20-23 44.6120875 44.6120875 44.6120875