condition mean min max ZT0-3 3.38275325475 2.251621705 4.5138848045 ZT4-7 6.4576579052500005 5.737392822 7.177922988500001 ZT8-11 8.694670182500001 8.044966335 9.34437403 ZT12-15 6.8488403479999995 5.2704373935 8.427243302499999 ZT16-19 5.9947034850000005 5.8127099495 6.176697020500001 ZT20-23 7.0127958215 6.7689068445 7.2566847985