condition mean min max ZT0-3 10.630648333333333 7.416395 12.62365 ZT4-7 10.454245 10.454245 10.454245 ZT8-11 9.41689 9.41689 9.41689 ZT12-15 8.449942499999999 6.69194 10.207944999999999 ZT16-19 8.55839 8.55839 8.55839 ZT20-23 9.146384999999999 9.146384999999999 9.146384999999999