condition mean min max ZT0-3 5.3480525 5.121639999999999 5.574465 ZT4-7 7.170585000000001 7.170585000000001 7.170585000000001 ZT8-11 6.40859 6.40859 6.40859 ZT12-15 0 0 0 ZT16-19 5.90588 5.90588 5.90588 ZT20-23 7.18151 7.18151 7.18151