condition mean min max ZT0-3 64.777979 64.777979 64.777979 ZT4-7 77.512711 77.512711 77.512711 ZT8-11 52.123011 52.123011 52.123011 ZT12-15 47.2686205 47.2686205 47.2686205 ZT16-19 39.5892055 39.5892055 39.5892055 ZT20-23 35.4003055 35.4003055 35.4003055