condition mean min max ZT0-3 12.281121 12.281121 12.281121 ZT4-7 12.972214 12.972214 12.972214 ZT8-11 10.928002 10.928002 10.928002 ZT12-15 11.5288965 11.5288965 11.5288965 ZT16-19 11.998885000000001 11.998885000000001 11.998885000000001 ZT20-23 12.107693999999999 12.107693999999999 12.107693999999999