condition mean min max ZT0-3 11.995067500000001 11.29687 12.693265 ZT4-7 24.9011 24.9011 24.9011 ZT8-11 31.634999999999998 31.634999999999998 31.634999999999998 ZT12-15 0 0 0 ZT16-19 32.1325 32.1325 32.1325 ZT20-23 26.3121 26.3121 26.3121