condition mean min max ZT0-3 47.922775 46.04375 49.8018 ZT4-7 44.41045 44.41045 44.41045 ZT8-11 32.74915 32.74915 32.74915 ZT12-15 0 0 0 ZT16-19 38.8583 38.8583 38.8583 ZT20-23 41.4352 41.4352 41.4352