condition mean min max ZT0-3 5.3172733333333335 4.69729 5.653180000000001 ZT4-7 1.8822 1.8822 1.8822 ZT8-11 5.938505 5.938505 5.938505 ZT12-15 11.125455 9.247910000000001 13.003 ZT16-19 12.1064 12.1064 12.1064 ZT20-23 11.4295 11.4295 11.4295