condition mean min max ZT0-3 38.514988 38.514988 38.514988 ZT4-7 53.167467 53.167467 53.167467 ZT8-11 49.6617355 49.6617355 49.6617355 ZT12-15 45.301812 45.301812 45.301812 ZT16-19 23.4026735 23.4026735 23.4026735 ZT20-23 20.2683125 20.2683125 20.2683125