condition mean min max ZT0-3 28.7 28.7 28.7 ZT4-7 7.3 7.3 7.3 ZT8-11 5.7 5.7 5.7 ZT12-15 6.050000000000001 6.050000000000001 6.050000000000001 ZT16-19 5.6 5.6 5.6 ZT20-23 14.6 14.6 14.6