condition mean min max ZT0-3 9.92164 9.92164 9.92164 ZT4-7 10.170639999999999 10.170639999999999 10.170639999999999 ZT8-11 8.89539 8.89539 8.89539 ZT12-15 9.712579999999999 9.712579999999999 9.712579999999999 ZT16-19 11.6392 11.6392 11.6392 ZT20-23 10.088180000000001 10.088180000000001 10.088180000000001