condition mean min max ZT0-3 22.18345 21.280450000000002 23.08645 ZT4-7 15.022400000000001 15.022400000000001 15.022400000000001 ZT8-11 21.7576 21.7576 21.7576 ZT12-15 0 0 0 ZT16-19 18.2853 18.2853 18.2853 ZT20-23 24.33095 24.33095 24.33095