condition mean min max ZT0-3 11.074471 11.074471 11.074471 ZT4-7 11.2680005 11.2680005 11.2680005 ZT8-11 11.060247 11.060247 11.060247 ZT12-15 10.766063 10.766063 10.766063 ZT16-19 11.9030305 11.9030305 11.9030305 ZT20-23 10.984019 10.984019 10.984019