condition mean min max ZT0-3 62.21755 62.21755 62.21755 ZT4-7 49.65975 49.65975 49.65975 ZT8-11 35.9614 35.9614 35.9614 ZT12-15 29.0091 29.0091 29.0091 ZT16-19 39.1446 39.1446 39.1446 ZT20-23 61.98555 61.98555 61.98555