condition mean min max ZT0-3 22.3391 20.826349999999998 23.85185 ZT4-7 25.6933 25.6933 25.6933 ZT8-11 32.8223 32.8223 32.8223 ZT12-15 0 0 0 ZT16-19 40.3226 40.3226 40.3226 ZT20-23 28.8182 28.8182 28.8182