condition mean min max ZT0-3 85.137705 85.137705 85.137705 ZT4-7 92.1052355 92.1052355 92.1052355 ZT8-11 87.608246 87.608246 87.608246 ZT12-15 87.434528 87.434528 87.434528 ZT16-19 89.240032 89.240032 89.240032 ZT20-23 80.451908 80.451908 80.451908