condition mean min max ZT0-3 10.938659 10.938659 10.938659 ZT4-7 11.9698225 11.9698225 11.9698225 ZT8-11 11.9061335 11.9061335 11.9061335 ZT12-15 11.0312555 11.0312555 11.0312555 ZT16-19 9.813687 9.813687 9.813687 ZT20-23 10.806483499999999 10.806483499999999 10.806483499999999