condition mean min max ZT0-3 10.129943333333333 8.383225 13.364 ZT4-7 8.45492 8.45492 8.45492 ZT8-11 3.098395 3.098395 3.098395 ZT12-15 4.162089999999999 3.390465 4.933714999999999 ZT16-19 4.122245 4.122245 4.122245 ZT20-23 7.983815 7.983815 7.983815