condition mean min max ZT0-3 11.135243 11.135243 11.135243 ZT4-7 11.134401 11.134401 11.134401 ZT8-11 9.849477499999999 9.849477499999999 9.849477499999999 ZT12-15 10.966343 10.966343 10.966343 ZT16-19 10.417378 10.417378 10.417378 ZT20-23 10.3922725 10.3922725 10.3922725