condition mean min max ZT0-3 9.245198 9.245198 9.245198 ZT4-7 8.4700435 8.4700435 8.4700435 ZT8-11 7.5645015 7.5645015 7.5645015 ZT12-15 8.1512895 8.1512895 8.1512895 ZT16-19 8.1194375 8.1194375 8.1194375 ZT20-23 8.8580025 8.8580025 8.8580025