condition mean min max ZT0-3 1.6912525 1.5817649999999999 1.80074 ZT4-7 1.27953 1.27953 1.27953 ZT8-11 13.9875 13.9875 13.9875 ZT12-15 0 0 0 ZT16-19 11.8202 11.8202 11.8202 ZT20-23 7.41755 7.41755 7.41755