condition mean min max ZT0-3 10.15603 7.744479999999999 11.812899999999999 ZT4-7 4.610415 4.610415 4.610415 ZT8-11 4.611195 4.611195 4.611195 ZT12-15 6.4954425 4.16066 8.830225 ZT16-19 7.648585 7.648585 7.648585 ZT20-23 11.99665 11.99665 11.99665