condition mean min max ZT0-3 40.168425 26.836199999999998 53.50065 ZT4-7 60.8352 60.8352 60.8352 ZT8-11 53.0073 53.0073 53.0073 ZT12-15 0 0 0 ZT16-19 103.47745 103.47745 103.47745 ZT20-23 47.3076 47.3076 47.3076