condition mean min max ZT0-3 10.141265 10.141265 10.141265 ZT4-7 11.697010500000001 11.697010500000001 11.697010500000001 ZT8-11 11.242721 11.242721 11.242721 ZT12-15 10.415751499999999 10.415751499999999 10.415751499999999 ZT16-19 10.813602 10.813602 10.813602 ZT20-23 13.080033 13.080033 13.080033