condition mean min max ZT0-3 185.554026 185.554026 185.554026 ZT4-7 186.3715885 186.3715885 186.3715885 ZT8-11 174.2828255 174.2828255 174.2828255 ZT12-15 189.9552415 189.9552415 189.9552415 ZT16-19 233.2300545 233.2300545 233.2300545 ZT20-23 186.7221315 186.7221315 186.7221315