condition mean min max ZT0-3 12.45 12.45 12.45 ZT4-7 62.1 62.1 62.1 ZT8-11 26.349999999999998 26.349999999999998 26.349999999999998 ZT12-15 19.150000000000002 19.150000000000002 19.150000000000002 ZT16-19 9.4 9.4 9.4 ZT20-23 10.55 10.55 10.55