condition mean min max ZT0-3 42.571725 40.7389 44.40455 ZT4-7 34.9958 34.9958 34.9958 ZT8-11 47.138400000000004 47.138400000000004 47.138400000000004 ZT12-15 0 0 0 ZT16-19 53.2579 53.2579 53.2579 ZT20-23 53.62205 53.62205 53.62205