condition mean min max ZT0-3 15.207441 15.207441 15.207441 ZT4-7 14.934566499999999 14.934566499999999 14.934566499999999 ZT8-11 17.453772999999998 17.453772999999998 17.453772999999998 ZT12-15 14.101037999999999 14.101037999999999 14.101037999999999 ZT16-19 14.379317 14.379317 14.379317 ZT20-23 14.606056500000001 14.606056500000001 14.606056500000001