condition mean min max ZT0-3 9.95946 9.95946 9.95946 ZT4-7 8.6869605 8.6869605 8.6869605 ZT8-11 9.8222375 9.8222375 9.8222375 ZT12-15 10.7092885 10.7092885 10.7092885 ZT16-19 9.774899000000001 9.774899000000001 9.774899000000001 ZT20-23 10.134649 10.134649 10.134649